Flora of North America species comparison

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Clematis texensis

Clematis hirsutissima

crimson clematis, scarlet clematis, scarlet leather flower, Texas clematis

Douglas' clematis, hairy clematis, leatherflower, sugar bowls, vaseflower
Stems

viny, to 3 m, glabrous or sometimes ± hirsute near nodes.

erect, not viny, 1.5-6.5 dm, hirsute (sometimes sparsely so in var. hirsutissima) or densely short, soft-pubescent to nearly glabrous.
Leaf

blade 1-pinnate;

leaflets 6-10 plus additional tendril-like terminal leaflet, ovate to nearly round, unlobed, 2-3-lobed, or most proximal occasionally 3-foliolate, 1-9 × 1-6 cm, leathery, ± prominently reticulate adaxially;

surfaces abaxially usually glabrous, occasionally sparsely pubescent, glaucous.

blade 2-3-pinnate;

leaflets often deeply 2-several-lobed, if lobed than lateral lobes usually small and distinctly narrower than central portion, leaflets or lobes linear to lanceolate, 1-6 × 0.05-1.5 cm, thin, not prominently reticulate;

surfaces sparsely to densely silky-hirsute, not glaucous.
Inflorescences

axillary, 1-7-flowered.

terminal, flowers solitary.
Flowers

ovoid to urn-shaped;

sepals rose-red to scarlet abaxially and at tip adaxially, ovate-lanceolate, 1.5-3 cm, margins not expanded, thick, not crispate, tomentose, tips acute to acuminate, recurved, abaxially glabrous.

broadly cylindric to urn-shaped;

sepals very dark violet-blue or rarely pink or white, oblong-lanceolate, 2.5-4.5 cm, margins narrowly expanded distally, 0.5-2 mm wide, thin, distally ± crisped, tomentose, tips obtuse to acute, slightly spreading, abaxially usually densely hirsute, occasionally moderately so.
Achenes

bodies appressed-pubescent;

beak 4-7 cm, plumose.

bodies densely long-pubescent;

beak 4-9 cm, plumose.
2n

= 16.

Clematis texensis

Clematis hirsutissima
Phenology Flowering spring–summer (Mar–Jun).
Habitat Woodlands, calcareous cliffs, and stream banks
Elevation 80-700 m (300-2300 ft)
Distribution
from FNA
TX
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CO; ID; MT; NE; NM; OK; OR; SD; UT; WA; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

Although widely cultivated because it is the only species of Clematis with truly red flowers, C.texensis is native only to the southeastern part of the Edwards Plateau, Texas.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Varieties 2 (2 in the flora).

The varieties of Clematis hirsutissima, although highly dissimilar in their extreme forms, intergrade extensively in Wyoming, Colorado, and Utah.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Leaflets and lobes linear to narrowly lanceolate, 0.5–6(–10) mm wide.
var. hirsutissima
1. Leaflets and lobes narrowly to broadly lanceolate or ovate, 5–15 mm wide.
var. scottii
Source FNA vol. 3. FNA vol. 3.
Parent taxa Ranunculaceae > Clematis > subg. Viorna Ranunculaceae > Clematis > subg. Viorna
Sibling taxa
C. addisonii, C. albicoma, C. baldwinii, C. bigelovii, C. catesbyana, C. coactilis, C. columbiana, C. crispa, C. drummondii, C. fremontii, C. glaucophylla, C. hirsutissima, C. lasiantha, C. ligusticifolia, C. morefieldii, C. occidentalis, C. ochroleuca, C. orientalis, C. pauciflora, C. pitcheri, C. recta, C. reticulata, C. socialis, C. tangutica, C. terniflora, C. versicolor, C. viorna, C. virginiana, C. vitalba, C. viticaulis, C. viticella
C. addisonii, C. albicoma, C. baldwinii, C. bigelovii, C. catesbyana, C. coactilis, C. columbiana, C. crispa, C. drummondii, C. fremontii, C. glaucophylla, C. lasiantha, C. ligusticifolia, C. morefieldii, C. occidentalis, C. ochroleuca, C. orientalis, C. pauciflora, C. pitcheri, C. recta, C. reticulata, C. socialis, C. tangutica, C. terniflora, C. texensis, C. versicolor, C. viorna, C. virginiana, C. vitalba, C. viticaulis, C. viticella
Subordinate taxa
C. hirsutissima var. hirsutissima, C. hirsutissima var. scottii
Synonyms Viorna coccinea Coriflora hirsutissima
Name authority Buckley: Proc. Acad. Nat. Sci. Philadelphia 13: 448. (1862) Pursh: Fl. Amer. Sept. 2: 385. (1814)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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