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Polypogon: Dichotomous Key
... 1a. Glumes tipped by an awn 4–10 mm long; lemmas tipped by an awn 0.5–1 (–4) mm long; ligules 2.5–16 mm long; plants annual 1b. Glumes unawned; lemmas unawned; ligules up to 5 mm...
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Leersia: Dichotomous Key
... 1a. Branches of the panicle 2 or more at some of the nodes; florets with 3 stamens; lemmas 4–7.5 mm long; principal leaf blades 15–30 cm long 1b. Branches of the panicle 1 per no...
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Apera: Dichotomous Key
... 1a. Leaves 3–5 mm wide; branches of the panicle ascending to spreading at anthesis, bearing flowers in the distal half of the branches 1b. Leaves 1–3 mm wide; branches of the pan...
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Sanicula: Dichotomous Key
...bearing 12–25 (–117) staminate flowers per umbellet; plants perennial 2a. Sepals 1–2 mm long, rigid, narrow-subulate; schizocarps 4-6 mm long, subsessile, slightly exceeded by the persist...
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Torilis: Dichotomous Key
... 1a. Umbel with 2 or 3 primary branches; prickles of schizocarp wide-spreading, only slightly ascending, up to 1 mm long 1b. Umbel with (3–) 5–10 primary branches [Fig. 358]; pric...
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Cichorium: Dichotomous Key
...Group 1 > Cichorium. Cichorium. 1a. Vegetative leaf blades pubescent, at least on the abaxial midrib; bracteal leaves subtending the capitula usually shorter...
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Ambrosia: Dichotomous Key
...with 1 or 2 pairs of pinnately arranged lobes that are confined to the base of the blade 1b. Staminate capitula peduncled, borne in 1 or more raceme-like capitulescences; staminate involu...
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Parthenium: Dichotomous Key
... 1a. Plants annual; leaf blades 1- or 2-times pinnatifid 1b. Plants perennial; leaf blades toothed, or some of them lobed near the base
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Hackelia: Dichotomous Key
...with 1–3 (–10) small glochids on the outer surface; intact schizocarp broad-pyramidal; basal leaf blades narrow-ovate to oblanceolate 1b. Mericarps with 10–25 glochids on the outer surfac...
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Boechera: Dichotomous Key
...(1995), Al-Shehbaz (2003). 1a. Fruiting pedicels erect; seeds aligned in 2 rows in each locule; petals 7–10 mm long, white to pink to rose-purple; lower stems usually with some mesifix...