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Key to Clematis
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=39843
1 Flowers numerous, in compound cymose-paniculate inflorescences; sepals white; filaments glabrous; [subgenus Clematis]. | |
2 Flowers mostly polygamo-dioecious, the pistillate with 18-60 carpels; anthers 0.5-1 mm long; leaf margins coarsely toothed with acute teeth; leaflets 3 (C. virginiana) or 5-7 (C. catesbyana), uniformly green; [native, though sometimes weedy]. | |
1 Flowers solitary or in groups of 3's; sepals usually at least partly bluish, purplish or red; filaments pubescent. | |
5 Leaves (most or all of them) simple, sessile or subsessile; plant an erect herb to 7 dm tall; [subgenus Viorna]. | |
7 Leaves of flowering material glabrous to sparsely pilose beneath, the largest 2-5 cm wide (or 3.5-11 cm wide in C. fremontii), with stomates on both surfaces; leaves of fruiting material often dark green, either with the secondary and tertiary veins forming prominent reticulations on the upper surface (C. fremontii) or the upper with the secondary and tertiary veins not forming prominent reticulations on the upper surface (C. albicoma, C. viticaulis, and C. baldwinii). | |
10 Leaf blades 0.2-2.5 (-3.5) cm wide, not notably reticulate on the upper surface; beak of the achene plumose with long hairs; [of wet pinelands of n. FL southward] | |
11 Sepal backs finely puberulent; pubescence on the summit of the achene and the base of the style closely appressed-ascending; mature styles tawny to deep reddish-brown, loosely spreading-recurved | |
17 Sepals yellowish-cream (sometimes lightly tinged with lilac); stamens densely and uniformly pubescent; [Carrizo Sands of ne. TX] | |
17 Sepals bright scarlet red; stamens neither densely nor uniformly pubescent; [Edwards Plateau and northeastwards into the Lampasas Cutplain of c. TX] | |
18 Plants erect, to 2-3 (-5) dm tall, forming clonal patches by underground rhizomes; leaflets linear-lanceolate, averaging ca. 10× as long as wide | |
18 Plants viny, sprawling or climbing, the stems usually over 1 m long, not rhizomatous-clonal; leaflets generally broader. | |
19 Leaves coriaceous, the secondary and tertiary veins forming prominent reticulations on the upper surface. | |
19 Leaves membranous to subcoriaceous, the secondary and tertiary veins forming faint, indistinct reticulations on the upper surface. | |
22 Principal leaves at mid-stem mostly pinnate, pubescent, slightly coriaceous with raised secondary and tertiary veins; inflorescence solitary in leaf axils, or cymose paniculate (1-3 flowered); sepals rarely solidly colored, sepals light pink, white, or bicolored; fruit compact; achene body orbicular in outline, the achene tails short recurvate; [open habitats (glades, barrens, blackbelt prairie remnants) over limestone] | |
22 Principal leaves at mid-stem pinnately trifoliate, glabrous or glaucescent, membranous without raised secondary or tertiary veins; inflorescence solitary, terminal, or cymose-paniculate (3-7 flowered); sepals cherry red, magenta pink, or dusky purple; fruit less compact; achene body elliptical in outline, the achene tails long recurvate; [forested systems, forest/woodland ecotones, and grasslands] |