New York Metropolitan Flora

Key to the genera of Ericaceae

1. Leaves 5 mm wide or less, often curled and appearing needle-like...2
1. Leaves 6 mm wide or more (commonly over 1 cm wide), usually not appearing needle-like...15

2. Leaves alternate...3
2. Leaves opposite, whorled, or subverticilate...10

3. Flowers showy, perfect...4
3. Flowers not showy, unisexual...9

4. Flowers 4-merous; fruit a white berry...Gaultheria
4. Flowers 5-merous; fruit a capsule or red berry...5

5. Ovary inferior; fruit a red or blue berry...Vaccinium
5. Ovary superior; fruit a capsule...6

6. Corolla salverform or campanulate; capsules septicidal...7
6. Corolla urseolate; capsules loculicidal..8

7. Capsule 2-3-locular; leaves glabrous beneath...Leiophyllum
7. Capsule 5-locular; leaves densely villous beneath...Rhododendron

8. Leaves white-hairy beneath...Andromeda
8. Leaves with orange scales beneath...Chamaedaphne

9. Flowers axillary; stigmas 6-9...Corema
9. Flowers in small terminal heads; stigmas 2-5 (usually 3)...Empetrum

10. Flowers showy, perfect...11
10. Flowers not showy, unisexual...14

11. Flowers 4-merous...12
11. Flowers 5-merous...13

12. Leaves opposite, 2-4 mm long...Calluna
12. Leaves whorled, 3-10 mm long...Erica

13. Petals fused together...Kalmia
13. Petals free...Leiophyllum

14. Flowers axillary; stigmas 6-9...Corema
14. Flowers in small terminal heads; stigmas 2-5 (usually 3)...Empetrum

15. Leaves opposite, whorled, or subverticilate...Kalmia
15. Leaves alternate...16

16. Flowers 4-merous...Gaultheria
16. Flowers 5-merous...17

17. Ovary inferior; fruit a blue berry...18
17. Ovary superior; fruit a capsule or red drupe...19

18. Leaves not glandular; ovary 4-5-locular with numerous ovules and seeds...Vaccinium
18. Leaves glandular; ovary 10-locular with 10 ovules and seeds...Gaylussacia

19. Plants prostrate or low-growing to 3 dm tall...20
19. Plants erect, more than 3 dm tall...22

20. Plants prostrate; leaves cordate at base, ciliate...Epigaea
20. Plants erect; leaves acute to rounded at the base, serrate or entire...21

21. Fruit a capsule; leaves serrate...Chimaphila
21. Fruit a red drupe; leaves entire...Arctostaphylos

22. Flowers campanulate or salverform; fruit a septicidal capsule... Rhododendron
22. Flowers urceolate; fruit a loculicidal capsule or a drupe...23

23. Leaves with orange scales; flowers single in the axils of foliage leaves... Chamaedaphne
23. Leaves glabrous or variously hairy, without scales; inflorescences racemes, panicles, or clusters...24

24. Leaves white-hairy beneath, often tightly curled...Andromeda
24. Leaves neither white-hairy beneath nor curled...25

25. Capsule with white-thickened sutures; anthers spurred or awned; leaves deciduous...Lyonia
25. Capsule without thickened sutures; anthers without spurs or awns (except Pieris, in which case the leaves are evergreen); leaves deciduous or evergreen (Pieris)...26

26. Leaves evergreen; anthers spurred...Pieris
26. Leaves deciduous; anthers not spurred...27

27. Flowers in lateral racemes...Leucothoe
27. Flowers in terminal panicles...Oxydendron

List of Ericaceae Genera

References to Ericaceae

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