Vor, II.] CROWFOOT FAMILY. 
1. Pulsatilla hirsutissima (Pursh) Brit- 
ton. American or Nuttall’s Pasque 
Flower. (Fig. 1581.) 
Clematis hirsutissima Pursh, Fl. Am. Sept. 385. 
Prasnohe Nuttalliana DC. Syst. 1: 193. 1818. 
Anemone patens var. Nuttalliana A, Gray, Man. Ed. 
Pee ale culissima Britton, Ann. N. Y. Acad. 
Sci. 6: 217. 1891. 
Villous, 6/-16’ high. Leaves much divided into 
narrow linear acute lobes, the basal on slender 
petioles, those of the involucre sessile and erect 
or ascending; sepals ovate-oblong, light bluish- 
purple; fruit a head of silky achenes with long 
plumose styles, like those of some Clematis. 
In dry soil, prairies of Illinois to the Northwest 
Territory, British Columbia, Nebraska and Texas. 
After flowering the peduncle elongates, sometimes 
toa foot or more. March-April. 
18. CLEMATIS L. Sp. Pl. 543. 1753. 
Climbing vines, or erect or ascending perennial herbs, more or less woody. Leaves op- 
posite, slender-petioled, pinnately compound, lobed, or in some species entire. Sepals 4 or 
5, valyate in the bud, petaloid. Petals none. Stamens. Pistils ©. Achenes 1-seeded. 
Style long, persistent, plumose, silky or naked. [Greek name for some climbing plant. ] 
About too species of very wide geographic distribution, most abundant in temperate regions. 
Besides the following, some 12 others occur in the southern and western parts of North America. 
*% Climbing vines; leaves pinnate or 3-foliolate. 
Flowers panicled, numerous ; filaments glabrous. 
Leaves 3-foliolate; eastern. 1. C. Virginiana. 
Leaves pinnately 5-7-foliolate; western. 2. C. ligustictifolia. 
Flowers solitary; filaments pubescent. 
* Sepals thin; fruiting styles silky, not plumose. 
Sepals conspicuously dilated; leaves thin, pinnately veined, 3. C. crispa. 
Sepals with recurved tips; venation strongly reticulated. 4. C. Simsiz. 
Sepals leathery, their tips recurved; fruiting styles plumose. 5. C. Viorna. 
% % Erect or ascending perennial herbs; leaves simple or pinnate. 
Glabrous, glaucous; leaves simple, or pinnate and tendril-bearing. 6. C. Addisoniz. 
Villous-pubescent; leaves simple or pinnate, not tendril-bearing. 
Leaves simple, entire or rarely lobed. 
Fruiting styles long, plumose; eastern species. 
Flowers yellowish-green; style-plumes brown; achenes straight. 
Flowers purple; style-plumes white; achenes distinctly oblique. 
07. CG. ochroleuca. 
. C. ovata. 
Zi 
8 
Fruiting styles short, silky; western species. 9. C. Fremontit. 
Leaves pinnate, or the lowest entire. 10. 
Ge Scoriz: 
1. Clematis Virginiana I. Virginia 
Virgin’s Bower. (Fig. 1582.) 
Clematis Virginianal,. Amoen. Acad. 4:275. 1759. 
A long vine, climbing over bushes in low 
Leaves glabrous or nearly so, trifoliolate; leaf- 
lets mostly broadly ovate, acute at the apex, 
toothed or lobed, sometimes slightly cordate; 
flowers white, in leafy panicles, polygamo-dioe- 
cious, 8’/-15’’ broad when expanded; filaments 
glabrous; persistent styles plumose, 1’ long or 
more. 
Georgia to Kansas, northward to Nova Scotia 
and Manitoba. Leaves rarely 5-foliolate. Ascends 
to 2600 ft. in Virginia. July—Sept. 
Clematis Virginiana Catesbyana (Pursh) Britton. 
Clematis Calesbyana Pursh, Fl. Am. Sept. 736. 1814. 
Leaves more or less pubescent, often biternate. 
South Carolina and Florida to Missouri and Mis- 
sissippl. 
woodlands and along fences and water-courses.. 
