New York Metropolitan Flora

Nomenclature

Vetrix Raf., Amer. Monthly Mag. & Crit. Rev. 1: 439. 1817. TYPE: Not designated.

Vimen Raf., Amer. Monthly Mag. & Crit. Rev. 1: 439. 1817. TYPE: Not designated.

Oisodix Raf., Amer. Monthly Mag. & Crit. Rev. 1: 439. 1817. TYPE: Not designated.

Usionis Raf., Alsogr. Amer. 14. 1838. TYPE: Not designated.

Ripselaxis Raf., Alsogr. Amer. 14. 1838. TYPE: Ripselaxis herbacea (L.) Raf. (=Salix herbacea L.).

Nectolis Raf., Alsogr. Amer. 15. 1838. TYPE: Not designated.

Amerina Raf., Alsogr. Amer. 15. 1838. TYPE: Not designated.

Diplusion Raf., Alsogr. Amer. 15. 1838. TYPE: Not designated.

Knafia Opiz, Seznam 56. 1852. TYPE: Unknown.

Lusekia Opiz, Seznam 61. 1852. TYPE: Unknown.

Key to the species of Salix

2. Leaves mostly glabrous beneath (excluding few hairs along main vein)...3
2. Leaves hairy throughout beneath...4

3. Small shrub, to 4 ft.; finely reticulate venation (3rd-level veins apparent); fruit glabrous; rare...Salix pedicellaris
3. Large shrub, over 4 ft.; without finely reticulate venation (3rd-level veins not readily visible); fruit hairy; common...Salix discolor

4. Leaves with white hairs beneath...Salix candida
4. Leaves with gray or red hairs beneath...5

5. Leaves with inrolled margins...Salix humilis
5. Leaves without inrolled margins...6

6. Leaves with sparse red or gray hairs beneath...Salix discolor
6. Leaves covered with gray hairs beneath...7

7. Leaves mostly 2.5 cm wide or less; scales subtending fruit pale...Salix bebbiana
7. Leaves (many) 2.6 cm wide or more; scales subtending fruit dark...Salix caprea

8. Leaves mostly glabrous beneath (excluding few hairs along main vein)...9
8. Leaves hairy beneath...19

9. Leaves opposite or subopposite...Salix purpurea
9. Leaves alternate...10

10. Petioles with glands (especially toward top)...11
10. Petioles lacking glands...13

11. Leaves with long-acuminate apices...Salix lucida
11. Leaves with acute-acuminate apices...12

12. Scales subtending fruit long-hairy throughout; native...Salix serissima
12. Scales subtending fruit long-hairy chiefly near the base; alien...Salix pentandra

13. Leaves glaucous beneath...14
13. Leaves green beneath...18

14. Leaves with teeth widely spaced, 3 or fewer per cm...Salix discolor
14. Leaves with teeth closely spaced, 4 or more per cm...15

15. Leaves mostly 1.9 cm wide or more...16
15. Leaves mostly 1.8 cm wide or less...17

16. Stipules large, persistent; small or no glands on teeth; scales subtending fruit dark...Salix eriocephala
16. Stipules small or lacking; prominent glands on teeth; scales subtending fruit pale...Salix fragilis

17. Leaves with long-acuminate and often falcate apices; twigs/branches pendulous; fruit glabrous...Salix babylonica
17. Leaves with acute-acuminate apices; twigs not pendulous; fruit hairy...Salix petiolaris

18. Leaves with teeth widely spaced, 5 or fewer per cm; usually lacking stipules; fruit hairy...Salix exigua
18. Leaves with teeth closely spaced, 6 or more per cm; usually with prominent stipules; fruit glabrous...Salix nigra

19. Leaves mostly 1.8 cm wide or less...20
19. Leaves mostly 1.9 cm wide or more...21

20. Current year’s twigs yellow-tan; fruit glabrous...Salix alba
20. Current year’s twigs brown-gray; fruit hairy...Salix sericea

21. Leaves with sparse red or gray hairs beneath...Salix discolor
21. Leaves covered with gray hairs beneath...22

22. Leaves mostly 2.5 cm wide or less; scales subtending fruit pale...Salix bebbiana
22. Leaves (many) 2.6 cm wide or more; scales subtending fruit dark...Salix caprea

List of Salix Species

Other Links

Interactive Salix key:

http://aknhp.uaa.alaska.edu/botany/salix-salicaceae-identification-using-intkey/

References to Salix

• Allen, P. H. 1962. Black willow dominates baldcypress-tupelo swamp eight years after clear cutting.
• Andersson, N. J. 1867. Monographia Salicum. Kongl. Svenska Vetenskapsakad. Handl. 6: i-v,1-180.
• Antibus, R. K.; Trappe, J. M.; Linkins, A. E. 1980. Cyanide resistant respiration in Salix nigra endomycorrhizae. Canad. J. Bot. 58: 14-20.
• Argus, G. W. 1980. The typification and identity of Salix eriocephala Michx. (Salicaceae). Brittonia 32(2): 170-7.
• Argus, G. W. 1986. The genus Salix (Salicaceae) in the southeastern United States. Systematic Botany Monographs 9: 170 p..
• Argus, G. W. 1986. Studies of the Salix lucida and Salix reticulata complexes in North America. Canad. J. Bot. 64: 541-551.
• Argus, G. W. 1974. An experimental study of hybridization and pollination in Salix (willow). Canad. J. Bot. 52: 1613-1619.
• Argus, G. W. 1984. Salix occidentalis Walter, the correct name for S. tristis Aiton (Salicaceae). Brittonia 36: 328-329.
• Argus, G. W. 1997. Infrageneric classification of Salix (Salicaceae) in the New World. American Society of Plant Taxonomists, Ann Arbor, MI. , 121 pages. (Systematic Botany Monographs; Vol. 52)
• Argus, G. W. 1984. The identity of Salix conifera Salicaceae. Brittonia 36: 321-327.
• Argus, G. W. 2007. Salix (Salicaceae) distribution maps and a synopsis of their classification in North America, north of Mexico. Harvard Papers in Botany 12: 335-368.
• Azuma, T et.al. 2000. Phylogenetic relationships of Salix (Salicaceae) based on rbcL sequence data. Amer. J. Bot. 87: 67-75.
• Ball, C. R. 1948. Salix petiolaris. Bull. Torrey Bot. Club 75: 178-87.
• Berry, E. W. 1917. Notes on the history of the willows and poplars. Pl. World 20: 16-28.
• Binns, W. W.; Blunden, G.; Woods, D. L. 1968. Distribution of leucoanthocyanidins, phenolic glycosides, and amino-acids in leaves of Salix species. Phytochemistry 7: 1577-81.
• Blackburn, K. B.; Heslop-Harrison, J. W. 1924. A preliminary account of the chromosomes and chromosome behavior in the Salicaceae. Ann. Bot. (London) 38: 361-378.
• Brunsfeld, S. J.; Soltis, D. E.; Soltis, P. S. 1991. Patterns of genetic variation in Salix section Longifoliae (Salicaceae). Amer. J. Bot. 78(6): 855-69.
• Buchler, W. 1996. Phyllotaxis and morphology of proximal leaves on vegetative axillary shoots of Salix and their systematic implications. Bot. Helvetica 106: 31-44.
• Chamberlain, C. J. 1897. Contributions to the life history of Salix. Bot. Gaz. 23: 147-79.
• Chen, J. H. et.al. 2010. Molecular phylogeny of Salix L. (Salicaceae) inferred from three chloroplast datasets and its systematic implications. Taxon 59: 29-37.
• Chmelar, J. 1978. Taxonomic importance of bud scales in the Salix genus. Folia Dendrol. 4: 5-21. (In Chech; English, German, & Russian summaries)
• Chmelar, J. 1981. Taxonomic importance of nectary structure in the genus Salix. Folia Dendrol. 8: 5-23. (In Chech; English summary)
• Chmelar, J. 1977. Taxonomic importance of capsule seed number in the genus Salix L. Cas. Slezsk. Muz., C, Dendrol. 26(1): 1-7. (In Chech; English summary)
• Chong, D. K. X.; Zsuffa, L.; Aravanopoulos, F. A. 1995. Genetic relationship between Salix exigua and other North American willows (Salix L.): evidence from allozyme variation. Biochem. Syst. Ecol. 23: 767-71.
• Collinson, M. E. 1992. The early fossil history of the Salicaceae. Proc. Roy. Soc. London Ser. B Biol. Sci. 98: 155-167.
• Cronquist, A. 1971. On the nomenclature of Salix bebbiana Sarg. Rhodora 73(796): 558-9.
• Crovello, T. J. 1966. Quantitative taxonomic studies in the genus Salix. Ph.D. Thesis University of California Herbarium,
• Daigle, B. I.; Simpson, J. D. 2009. Collecting and processing Salicaceae seeds. Native Plants J. 10: 48-51.
• Dawes, D. 2003. Using a shop vacuum to clean Salicaceae seeds. Native Plants J. 4: 140.
• Denneler, B; Bergeron, Y.; Begin, Y. 1999. An attempt to explain the distribution of the tree species composing the riparian forests of Lake Duparquet, southern boreal region of Quebec, Canada. Canad. J. Bot. 77: 1744-1755.
• Dionigi, C. P. 1982. The effects of soil waterlogging on the growth and distribution of Salix nigra and S. exigua (Salicaceae) plants in the Atchafalaya River basin of Louisiana. M.S. Thesis Univ. Southwestern Louisiana, Lafayette,
• Dionigi, C. P.; Mendelssohn, I. A.; Sullivan, V. I. 1985. Effects of soil waterlogging on the energy status and distribution of Salix nigra and S. exigua (Salicaceae)in the Atchafalaya River basin of Louisiana. Amer. J. Bot. 72(1): 109-19.
• Dorn, R. D. 1975. A systematic study of Salix section Cordatae in North America. Canad. J. Bot. 53(15): 1491-522.
• Dorn, R. D. 1976. A synopsis of American Salix. Canad. J. Bot. 54: 2769-2789.
• Dorn, R. D. 1995. A taxonomic study of Salix section Cordatae subsection Luteae (Salicaceae). Brittonia 47(2): 160-74.
• Dorn, R. D. 1975. Cytological and taxonomic notes on North American Salix. Madrono 23: 99. (see also Diss. Abstr. Int., B 35(7):3182. 1975.)
• Dorn, R. D. 1994. North American Salix (Salicaceae): Typification and notes. Phytologia 77(2): 89-95.
• Dorn, R. D. 1998. A taxonomic study of Salix section Longifoliae (Salicaceae). Brittonia 50: 193-210.
• Falinski, J. B. 1980. Changes in the sex- and age-ration in populations of pioneer dioecious woody species (Juniperus, Populus, Salix) in connection with the course of vegetation succession in abandoned farmlands. Ekologia Polska 28: 327-65.
• Fernald, M. L. 1946. Technical studies on North American plants. II. Difficulties in North American Salix. Rhodora 48: 13-6,27-49.
• Fernald, M. L. 1904. Two northeastern allies of Salix lucida. Rhodora 6: 1-8.
• Fernald, M. L. 1909. Salix pedicellaris and its variations. Rhodora 11: 157-62.
• Fernald, M. L. 1912. Salix serissima in southern Connecticut. Rhodora 14: 80.
• Fisher, M. J. 1928. The morphology and anatomy of the flowers of the Salicaceae I. Amer. J. Bot. 15: 307-326.
• Fisher, M. J. 1928. The morphology and anatomy of the flowers of the Salicaceae II. Amer. J. Bot. 15: 372-394.
• Fisher, M. J. 1923. The anatomy of the flower of the Salicaceae. Ph.D. Dissertation Cornell Univ., Ithaca, NY165 p.
• Fleming, G. P.; Ludwig, J. C. 1996. Noteworthy collections- Virginia. Castanea 61: 89-94.
• Flora of North America Editorial Committee. 2010. Flora of North America. Volume 7. Magnoliophyta: Salicaceae to Brassicaceae. Oxford Univ. Press, New York. , 797 pages. (ISBN 9780195318227)
• Fontana, A. 1962. Researches on the mycorrhizae of the genus Salix. Allionia 8: 67-85.
• Forbes, F. F. 1909. Salix subsericea a distinct species. Rhodora 11: 9-12.
• Fox, J. F. 1992. Pollen limitation of reproductive effort in willows. Oecologia 90: 283-7.
• Glenn, Steven D. 1995. Honeybees (Apis sp.) and bumblebees (Bombus sp.) visiting various willow ({Salix spp.) flowers.
• Glenn, Steven D. 1996. Bee (Andrena sp.) visiting Salix flowers.
• Graenicher, S. 1900. The fertilization and insect visitors of our earliest entomophilous flowers. Bull. Wisconsin Nat. Hist. Soc. 1: 73-84.
• Groendijk-Wilders, N.; Brandenburg, W. A.; Jarvis, C. E. 1988. Lectotypification of Salix alba L. (Salicaceae). Taxon 37: 164-7.
• Hardig, T. M. et.al. 2000. Morphological and molecular evidence for hybridization and introgression in a willow (Salix) hybrid zone. Molec. Ecol. 9: 9-24.
• Holden, R. 1912. Reduction and reversion in the North American Salicales. Ann. Bot. 26: 165-173.
• Hosner, J. F. 1958. The effects of complete inundation upon seedlings of six bottomland tree species. Ecology 39: 371-3.
• Hunter, J. C.; Mattice, J. A. 2002. The spread of woody exotics into the forests of a northeastern landscape, 1938-1999. J. Torrey Bot. Soc. 129: 220-227.
• Jarvis, C. E. 1992. Seventy-two proposals for the conservation of types of selected Linnaean generic names, the report of Subcommittee 3C on the lectotypification of Linnaean generic names. Taxon 41: 552-83.
• Julkunen-Tiitto, R. 1986. A chemotaxonomic survey of phenolics in leaves of northern Salicaceae species. Phytochemistry 25: 663-668.
• Karrenberg, S.; Suter, M. 2003. Phenotypic trade-offs in the sexual reproduction of Salicaceae from flood plains. Amer. J. Bot. 90: 749-754. (5)
• Kawase, M. 1964. Centrifugation, rhizocaline and rooting in Salix alba L. Physiol. Pl. (Copenhagen) 17: 855-65.
• Kehl, A. et.al. 2008. Genotypical and multiple phenotypical traits discriminate Salix x rubens Schrank clearly from its parent species. Pl. Syst. Evol. 275: 169-179.
• Kim, K. H.; Zsuffa, L.; Keeney, A.; Mosseler, A. 1990. Interspecific and intraspecific variation in pollen morphology in four species of Salix. Canad. J. Bot. 68: 1497-501. (French summary)
• Koncalova, M. N.; Jicinska, D. 1982. Ecological factors of flowering and pollen quality in three willow species. Folia Geobot. Phytotax. 17(2): 197-205.
• Kopp, R. F. et.al. 2002. Collection and storage of pollen from Salix. Amer. J. Bot. 89: 248-252.
• Krichfalushii, V. V.; Holyshkin, L. V. 1985. Chromosome numbers of representatives of the genus Salix. Ukrayins'k Bot. Zhurn. 42: 33-34. (In Ukranian)
• Krizo, M. 1977. Contribution to the knowledge of pollen grains of hybrids in the genus Salix L. Folia Dendrol. 3: 55-74. (In Chech; English, German, & Russian summaries)
• Kuzovkina, Y. A.; Knee, M.; Quigley, M. F. 2004. Effects of soil compaction and flooding on the growth of 12 willow (Salix L.) species. J. Environ. Hort. 22: 155-160.
• Lamb, G. N. 1915. Willows: Their growth, use and importance.
• Lautenschlager, F. D. et.al. 1993. On the distinction of Salix fragilis from its hybrid Salix x rubens. Bauhinia 11: 35-36. (In German)
• Leskinen, E.; Alstrom-Rapaport, C. 1999. Molecular phylogeny of Salicaceae and closely related Flacourtiaceae: evidence from 5.8S, ITS 1 and ITS 2 of the rDNA. Pl. Syst. Evol. 215: 209-227.
• Lin, J. et.al. 2009. Population genetic structure of native versus naturalized sympatric shrub willows (Salix; Salicaceae). Amer. J. Bot. 96: 771-785. (S. purpurea & S. eriocephala)
• Lovell, J. H. 1897. Fertilization of Alnus incana and Salix discolor. Bull. Torrey Bot. Club 24: 264-5.
• Malyutina, E. T. 1972. On the morphological nature of flower parts in some species of the genus Salix and possible ways of their evolution. Bot. Zhurn. (Moscow & Lenengrad) 57(5): 524-30. (In Russian; see also Bot. Zhur. 57(6):623-631. 1972.)
• Malyutina, E. T.; Malyutin, K. G. 1975. Morphology and evolution of Salix L. flower. (Abstract only)
• Matzke, E. B. 1936. The effect of street lights in delaying leaf-fall in certain trees. Amer. J. Bot. 23: 446-52.
• McLeod, K. W.; McPherson, J. K. 1973. Factors limiting the distribution of Salix nigra. Bull. Torrey Bot. Club 100: 102-10.
• Meeuse, A. D. J. 1978. Entomophily in Salix: theoretical considerations. In: The pollination of flowers by insects, Linnean Soc. Symp. No. 6. Academic Press, New York, London. , 47-50 pages.
• Mehrhoff, L. J. 1985. Notes on the flora of Connecticut -I. The Salicaceae of Connecticut. Newsletter Conn. Bot. Soc. 13(March): 9-12.
• Meikle, R. D. 1984. Willows and poplars of Great Britian and Ireland. Botanical Society of the British Isles, London. , 198 pages. (Despite title, covers many species found in the northeastern USA)
• Miller, E. S. 1878. Long Island plants. Bull. Torrey Bot. Club 6: 258-9.
• Mosseler, A. 1990. Hybrid performance and species crossability relationships in willows (Salix). Canad. J. Bot. 68: 2329-38. (French summary)
• Mosseler, A. 1989. Interspecific pollen-pistil incongruity in Salix. Canad. J. Forest Res. 19: 1161-8.
• Mosseler, A.; Papadopol, C. S. 1989. Seasonal isolation as a reproductive barrier among sympatric Salix species. Canad. J. Bot. 67: 2563-70. (French summary)
• Mosseler, A.; Zsuffa, L. 1989. Sex expression and sex ratios in intra- and interspecific hybrid families of Salix L. Silvae Genet. 38: 12-7.
• Mueller, M. H. et.al. 2002. The potential role of ducks in wetland seed dispersal. Wetlands 22: 170-178.
• Nakajima, Y. 1921. Length of life of the seed of the genus Salix. Bot. Mag. (Tokyo) 35: 17-42.
• Newsholme, C. 1992. Willows, the genus Salix. Timber Press, Portland, OR. , 224 pages. (also pub. by B.T. Batsford, London)
• Orians, C. M. et.al. 1999. Water availability alters the relative performance of Salix sericea, Salix eriocephala, and their F1 hybrids. Canad. J. Bot. 77: 514-522.
• Orians, C. M.; Roche, B. M.; Fritz, R. S. 1996. The genetic basis for variation in the concentration of phenolic glycosides in Salix sericea: an analysis of heritability. Biochem. Syst. Ecol. 24: 719-24.
• Ottenbreit, K. A.; Staniforth, R. J. 1992. Life cycle and age structure of ramets in an expanding population of Salix exigua (sandbar willow). Canad. J. Bot. 70(6): 1141-6.
• Pezeshki, S. R. et.al. 1998. Effects of soil moisture regimes on growth and survival of black willow (Salix nigra posts. Wetlands 18: 460-470.
• Reiss, H. C. W. 1970. An anatomical key to the local species of Salix. M.S. Thesis Cornell Univ., Ithaca, NY69 p.
• Rowlee, W. W. 1900. North American willows. Bull. Torrey Bot. Club 27: 247-57.
• Rowlee, W. W.; Wiegand, K. M. 1896. Salix candida Willd., and its hybrids. Bull. Torrey Bot. Club 23: 194-201.
• Santamour, F. S. 1992. Biochemical verification of hybridity in weeping willow. J. Arboric. 18(1): 6-9. (Also S. alba & S. fragilis)
• Schaff, S. D. et.al. 2002. Effects of pre-planting soaking on growth and survival of black willow cuttings. Restoration Ecol. 10: 267-274.
• Schneider, C. 1920. Notes on American willows. V.-XII. J. Arnold Arbor. 1:1-32, 67-97, 147-171, 211-232. 2:1-25, 65-90, 18
• Schneider, C. 1919. Notes on American willows. IV. Species and varieties of section Longifoliae. Bot. Gaz. 67: 309-46.
• Schramm, J. R. 1966. Plant colonization studies on black wastes from anthracite mining in Pennsylvania. Trans. Amer. Philos. Soc. 56: 1-194.
• Simpson, J. D.; Daigle, B. I. 2009. Five years' storage of seeds from three willow species. Native Plants J. 10: 63-67. (Salix bebbiana, S. discolor, S. eriocephala)
• Small, E. 1976. Insect pollinators of the Mer Bleue peat bog of Ottawa. Canad. Field-Naturalist 90: 22-28.
• Sohma, K. 1993. Pollen diversity in Salix (Salicaceae). Sci. Rep. Tohoku Univ., IV 40(2): 77-178.
• Stout, A. B. 1928. Dichogamy in flowering plants. Bull. Torrey Bot. Club 55: 141-53.
• Suda, Y.; Argus, G. W. 1968. Chromosome numbers of some North American Salix. Brittonia 20: 191-7.
• Tellefsen, M. A. 1922. The relation of age to size in certain root cells and in vein-islets of the leaves of Salix nigra Marsh. Amer. J. Bot. 9: 121-39.
• Tesky, J. L. 1993. Salix bebbiana. ()
• Tesky, J. L. 1992. Salix nigra. ()
• Thibault, J. 1998. Nuclear DNA amount in pure species and hybrid willows (Salix): a flow cytometric investigation. Canad. J. Bot. 76: 157-165.
• Thiebaut, M. 2000. A foliar morphometric approach to the study of Salicaceae. Bot. Rev. 66: 423-439.
• Tollsten, L.; Knudsen, J. T. 1992. Floral scent in dioecious Salix (Salicaceae): a cue determining the pollination system. Pl. Syst. Evol. 182: 229-37.
• Tormo, M. R. 1996. Pollen production in anemophilous trees. Grana 35: 38-46.
• Triest, L. 2001. Hybridization in staminate and pistillate Salix alba and S. fragilis (Salicaceae): morphology versus RAPDs. Pl. Syst. Evol. 226: 143-154.
• Triest, L. et.al. 1999. Genetic variation and putative hybridization in Salix alba and S. fragilis (Salicaceae): evidence from allozyme data. Pl. Syst. Evol. 215: 169-187.
• Triest, L. et.al. 2000. RAPD of controlled crosses and clones from the field suggests that hybrids are rare in the Salix alba-Salix fragilis complex. Heredity 84: 555-563.
• Tucker, G. C. 1996. Salix atrocinerea - an overlooked willow in New York State. New York Flora Association Newsletter 7(2): 2.
• Tucker, G. C. 2007. Additions to the flora of Connecticut. Rhodora 109: 459-463.
• Uchytil, R. J. 1989. Salix exigua. ()
• Van Der Werf, F. 1983. Discriminating visiting of Salix by Apis. In: Pollen: biology and implications for plant breeding. Elsevier, New York. , 83-9 pages.
• Werf, E. Van Der 1983. Discriminating visits of Salix by Apis. In: Pollen: biology and implications for plant breeding. Elsevier, New York. , 83-9 pages.
• Wilkinson, J. 1944. The cytology of Salix in relation to its taxonomy. Ann. Bot. (London) 8: 269-84.
• Williams, T. Y. 1990. Salix serrisima. ()
• Young, H. W. 1874. Additions to Suffolk Co. Catalogue. Bull. Torrey Bot. Club 5: 34.
• Zasada, J. C.; Densmore, R. 1979. A trap to measure Populus and Salix seedfall. Canad. Field-Naturalist 93: 77-9.
• van der Werf, F.; Cappellato, R.; Meeuse, A. D. J. 1981. Entomophily in Salix. Efficacy and flower constancy of insects visiting some willows and sallows. Beitr. Biol. Pflanzen 56: 105-16.