Genus 24. 



CROWFOOT FAMILY. 



9. Thalictrum polygamum Aluhl. Fall Aleadow-Rue. Fig. 1940. 



Thalictrum polygamum Muhl. Cat. 54. 1S13. 

 Thalictrum Cornuti T, & G. FI. N. A. i : 38. 1838. 

 Not L. 1753. 



Stout, 3-li high, branching, leafy, smooth or 

 pubescent but not glandular nor waxy. Leaves 

 3-4-ternate ; leaflets moderately thick, light green 

 above and paler beneath, oblong, obovate or or- 

 bicular, with 3 main apical pointed or obtuse 

 lobes; panicle compound, leafy, a foot long or 

 more; flowers polygamous, white or purplish; 

 filaments broadened, narrowly clavate; anthers 

 oblong, short ; achenes ovoid, short-stipitate, 6-8- 

 winged, glabrous or pubescent. 



Newfoundland to Florida, Ontario and Ohio. Its 

 favorite habitat is in open sunny swamps. Ascends 

 to 2500 ft. in Virginia. Silver-weed. Rattlesnake- 

 bite. Musket- or musquash-weed. Celandine. 



Several additional species of Thalictrum from 

 within our range have been described by Professor 

 Greene, at least some of which are referable to T. 

 polygamum as races. 



25. ADONIS [Dill.] L. Sp. PI. 547. 1753. 



Erect, annual or perennial herbs. Leaves alternate, pinnately dissected into numerous 

 linear segments. Flowers yellow or red, solitary, terminal. Petals 5-16, conspicuous. Car- 

 pels 00, i-ovulcd. Achenes capitate or spicate, rugose-reticulated, tipped with the persistent 

 styles. [Mythological name for a favorite of Venus, changed into a flower.] 



A genus of showy-flowered plants, natives of 

 the north temperate regions of Europe and Asia, 

 consisting of the following and about five other 

 species. Type species: Adonis annua L. 



I. Adonis annua L. Pheasant's or 

 Bird's E_ye. Fig. 1941. 



Adonis annua L. Sp. PI. 547. 1753. 

 Adonis autumnalis L. Sp. PI. Ed. 2, ; 



I. 1763. 



Annual, erect, i-2 high, branched, gla- 

 brous. Leaves finally dissected, the low'er 

 petioled, the upper sessile, the segments acute; 

 sepals smooth, deciduous ; flowers 9"-i8" 

 broad, nearly globular, orange or red, the 

 petals obovate, and darker colored at the base ; 

 achenes spicate. 



Commonly cultivated for ornament ; sponta- 

 neous in gardens and occasionally escaped into 

 waste places, especially southward. Fugitive 

 from Europe. Summer. Adonis'-flower. Red- 

 morocco. Camomile. 



26. CLEMATIS L. Sp. PI. 543- i753- 

 Climbing vines, more or less woody. Leaves opposite, slcnder-petioled, pinnately com- 

 pound. Flowers cymose-paniculate, our species dioecious, or nearly so. Sepals 4 or 5, 

 valvate in the bud, spreading, petaloid. Petals none. Stamens numerous, spreading; fila- 

 ments mostly glabrous; anthers short, blunt. Pistils numerous. Achenes i-seeded. Style 

 long, persistent, plumose. [Greek name for some climbing plant.] 



About 25 species of very wide geographic distribution. Besides the following, several others 

 occur in the southern and western parts of North America. Type species : Clematis vitalba L. 



Leaves 3-foIiolate : eastern. i. C.virginiana. _ 



Leaves pinnately 5-7-foliolate ; western. 2. C. ligusticifolia. 



