What’s a dichotomous key?
Help
- Group 1Lycophytes, Monilophytes
- Group 2Gymnosperms
- Group 3Monocots
- Group 4Woody angiosperms with opposite or whorled leaves
- Group 5Woody angiosperms with alternate leaves
- Group 6Herbaceous angiosperms with inferior ovaries
- Group 7Herbaceous angiosperms with superior ovaries and zygomorphic flowers
- Group 8Herbaceous angiosperms with superior ovaries, actinomorphic flowers, and 2 or more distinct carpels
- Group 9Herbaceous angiosperms with superior ovaries, actinomorphic flowers, connate petals, and a solitary carpel or 2 or more connate carpels
- Group 10Herbaceous angiosperms with superior ovaries, actinomorphic flowers, distinct petals or the petals lacking, and 2 or more connate carpels
- You are here:
- Dichotomous Key
- Rhamnaceae
- Rhamnus
Rhamnus
See list of 4 species in this genus-
1a. Flowers with 5 sepals, 0 petals, and 5 stamens; leaves alternate; branches unarmed; plants 0.15–1 m tall
-
1b. Flowers with 4 sepals, petals, and stamens [Fig. 824]; leaves alternate, subopposite, or opposite (often displaying all arrangements on a given plant); plants often armed with a spine-like process near the apex of some branchlets or in the forks of some branches; plants up to 10 m tall
-
2a. Petioles 5–15 mm long, (0.03–) 0.10–0.16 (–0.23) times as long as the blade; leaf blades with 5 or 6 (–8) pairs of primary lateral veins, abaxially pubescent with gold-yellow hairs on the veins and/or in the leaf axils (at least when young), turning yellow or gold-yellow abaxially when dry
-
2b. Petioles 10–40 mm long, (0.08–) 0.25–0.50 (–0.75) times as long as the blade; leaf blades with 3–5 (–6) pairs of primary lateral veins; usually some branchlets and branches on a plant with a spine-like process; leaf blades glabrous abaxially or with ± white hairs on the veins and/or in the vein axils, remaining green to pale green abaxially when dry
-
3a. Leaf blades (1.9–) 3–6.6 cm long, 3 or 4 pairs of lateral veins, elliptic to ovate or broad-ovate; drupe with 3 or 4 pyrenes
-
3b. Leaf blades (4–) 6–13 cm long, with 4 or 5 (–6) pairs of lateral veins, oblong to elliptic or elliptic-obovate; drupe with 2 pyrenes
-
-
Show photos of: Each photo represents one species in this genus.