PENrANDlil-l. rOLlGYMA. £j07 



300. SIBBALDIA. L. 



Calix 10-cleft, alternnte segments narrower. 

 Tetals 5. Siijlts pj-oceediiii? Jatenilly (Vom tlie 

 germ, (as in jKosa, Fokntllla, 6cc.) Seeds 

 about 5. 



Herbaceous alpine plants, with ternatelydividedleaves, 

 leaflets simple ur subdivided; flowers axiUai-y and termi- 

 nally ag-gregated, styles sometimes 10. 



Species. 1. S. erecla. ^. parvifiora. Oas. Biennial; 

 pilose. Stem eivct, 4 to 6 inclies hiij|i, numerously brancli- 

 td towards the summit. Leaves collected in a rosette, 

 on the stem alternate and sessile, radical somev/iiat twice 

 trifid, segments subdivided, caiiline leaves subbipinnatifid, 

 laciniae linear, obtuse; flowers sessile In terminil iascicles. 

 Petals white, suboviite, obtuse, scarcely longer than the 

 calix. Hab. On the liighest gravelly hill's, 10 to 15 miles 

 from tlie Mandan villages. — 2. procumbens. 



S. procumbens is also a native ot" the F^uropean Alps, 

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

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

 Esq. 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 Tournefort in Cappadocia. 



Order VL— POLYGYNIA. 

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



Calix none. Petals 5. Lepanthia 5, pedicel- 

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



Suffi'uticose, root yellow; leaves simply or doubly pseu- 

 dopinnate, partly sheathing at the base; flowers termi- 

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

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

 hence it is distinctly related to the second section of the 

 RanuxculacejE of Jussieu.) 



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

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

 where it chiefly aflTects the mountains.— The only species. 



