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Chenopodium: Dichotomous Key
...flowers 2–12 mm wide; most or all fruits vertically oriented 4a. Glomerules of flowers 2–5 mm wide; sepals at maturity herbaceous (somewhat fleshy in var. humile); horizontal seeds...
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Centaurea: Dichotomous Key
...(1992) was based on a specimen of C. nigra (Fernald 1922a). Reference: Keil and Ochsmann (2006). 1a. Involucral bracts tipped by 1 or more spines [Fig. 387]; disk corollas yello...
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Veronica: Dichotomous Key
...style 2.5–3.5 mm long 7b. Leaf blades oval or oblong to oblong-obovate, broadest near or distal to the middle, rounded at the apex; style 1.8–2.2 mm long 6b. Leaf blades of t...
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Fabaceae: Dichotomous Key
... 23a. Leaves with 30–60 leaflets (the upper leaves with fewer leaflets); fruit 10–20 cm long, transversely septate 23b. Leaves with 2–22 leaflets; fruit 0.6–9 cm long (5–20 (–30) ...
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Rosa: Dichotomous Key
...5–20 ×5–10 mm; petals 10–25 mm long, white 6b. Leaves with 3–7 leaflets 20–60 ×20–30 mm; petals 25–35 mm long, pink (in part) 5b. Flowers solitary or 2–6 and ...
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Salix key for mature vegetative material: Dichotomous Key
...0.5–2 (–2.5) cm long, 1.7–3.6 times as long as wide; petioles 2–4 (–6) mm long; winter buds 1–3 (–4) mm long (in part) 4b. Leaf blades 2–4 cm long, mostly 1.2–2 times as long as wide; pe...
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Sparganium emersum (simple-stemmed bur-reed)
...1.5–2 mm long, and staminate spikes contiguous (vs. S. emersum, with distal portion of leaves with a prominent abaxial keel or triangular in cross-section, beak of fruit 2–4.5 mm long, and at least so...
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Boraginaceae: Dichotomous Key
... 22a. Plants perennial; corolla 4–5 mm long; leaves with 2 or 3 conspicuous, lateral veins; mericarps lustrous, white to white-brown, smooth 22b. Plants annual (rarely biennial); ...
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Cyperaceae: Dichotomous Key
...122, 123, 124] 14b. Achenes without tubercles or with small, relatively inconspicuous style bases [Figs. 66, 121] 15a. Perianth dimorphic––an outer set of 3 retrorse-barbella...
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Asteraceae Group 5: Dichotomous Key
... 2a. Leaf blades lanceolate or elliptic to ovate, 12–200 mm wide; involucres 8–20 mm in diameter; rays 15–40 mm long, conspicuously surpassing the involucres; body of cypsela not contracted ju...