fENTANDllIA, r.iLVGlNIA. 207 



^00. SIBBALDfA. L. 



Calix 10-clcft, alternate scji^ments narrower. 

 Petals 5. Styles proceed iui;' iatei'ally tVoai tite 

 germ, (as in Rosa, Foteutilla, &c.) Seeds 

 about 5. 



Herbaceous alp'ne plants, with ternately divided leaves, 

 Jeaflets simple or subdivided; flowers axillary and termi- 

 nally ag-grcf^ated, styles soinetimts lU. 



Species. 1. S. erectcu fi. parvi/iora. Ods. Biennial; 

 pilose. Stem ercct, 4 to 6 inches !ug-h, numerously brancli- 

 ed towards the summit. Leaves collecled in a rosette, 

 on the stem alternate and sessile, radical somewhat twice 

 trifid, seg-ments subdivided, cauline leaves subbipinnatifid, 

 laciniae linear, obtuse; flowers sessile in terminal fascicles. 

 Petals white, subovate, obtuse, scarcely longer than the 

 calix. Hab. On the highest gravelly hills, 10 to 15 miles 

 froni the Mandan villages. — 2. pro-cumbens. 



S. procutnbens is also a native of the European Alps, 

 and S. erecta is equally indigenous to Siberia, In Pal- 

 lass's herbarium, now in the possession of A. B. Lambert, 

 Ksq. there are 2 very distinct varieties of this plant, 1 with 

 petals which are considerably longer than the calix; nei. 

 ther of these are, however, so small flowered as the Mis- 

 souri plant. Of this genus there is likewise another spe- 

 cies indigenous to the Altaic Alps of Siberia, and a fourth 

 discovered by Toumefort in Cappadocia. 



Order VI.— POLYGYNIA. 

 SOI. ZANTHORHIZA, L. (Yellow-root.) 



Calix none. Petals 5. Lepanthia 5, pedicel- 

 late. Capsules 5 to 8, l-seeded, semibivalve. 



Suftruticose, root yellow; leaves simply or doubly pseu- 

 dopinnate, partly sheathing at the base; flowers' termi 

 nal, in divided racemes, bracteolate. (Styles about 6 or 

 8. Germs 2 or 3-seeded. Capsules by abortion l-seeded; 

 hence it is distincdy related to the second section of the 



JiANUNCULACEiK of Jussieu.) 



Species. 1. Z. apiifolia. Abundant on the banks of 

 the river Ohio, as well as in the southern Atlantic states, 

 where it chiefly affects the mountJiins. — The only speciea. 



