PENTANDRIA. POLYGYNEA. 207 
$00, SIBBALDIA, L, 
. Calia 10-cleft, alternate segments narrower. 
Petals 5. Styles proceeding lateraily from the 
germ, (as in Rosa, Poteniilla, &c.) Seeds 
about 5. 
Herbaceous alpine plants, with ternately divided leaves, 
leaflets simple or subdivided; flowers axillary and termi- 
nally aggregated, styles sometimes 10. 
Species. 1. S. erecta. B. parviflora. Ops. Biennial; 
ft pilose. Stem erect, 4 to 6 inciies high, numerously branch- 
' ed towards the summit. Leaves collected in a rosette, 
| on the stem alternate and sessile, radical somewhat twice 
h trifid, segments subdivided, cauline leaves subbipinnatifid, 
laciniz linear, obtuse; flowers sessile in terminal fascicles. 
Petals white, subovate, obtuse, scarcely longer than the 
calix. Has. On the highest gravelly hills, 10 to 15 miles 
from the Mandan yillages.—2. procumbens. — 
S. pi ng is also a native of the E 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 VI.—POLYGYNIA. . 
: 501. ZANFHORHIZA. L. (Yellow-root.) 
a Calix none. Petals 5., Lepanthia 5, pedicel- 
late. Capsules 5 to 8, 1-seeded, semibivalve. 
Suftruticose, root yellow; leaves simply or doubly pseu- 
pel icayn: partly sheathing at the base; flowers termi- 
3 in divided racemes, bracteolate. (Styles about 6 or 
4 8. Germs 2 or 3-seeded. Capsules by abortion l-seeded; «_ 
hence it is distinctly related to the second section of the _ 
‘Ranuncucacea of Jussieu.) 
Species. 1. aero Abundant on the banks of 
the river Ohio, as well as in the soutiern Atlantic states, 
‘where it chiefly affects the mountains. —The only sj 
