ee 
~ 
of Cowania and Sieversia. 577 
dones spathulatæ, plano-convexæ : radicula subulata, coty- 
ledonibus dupló brevior, recta, centripeta. 
The habit of this plant, so widely different from that of the 
species of Sieversia hitherto recorded, led me at first to suspect 
' it might prove a distinct genus ; but after a careful examination 
of the parts of fructification; I.could discover nothing material 
to confirm my suspicion. À comparison of the description of 
this plant with Mr. Brown's excellent cliaracter of Sieversia, 
given above, will show how nearly they coincide in every essen- 
tial point. ‘The other species of Sieversia are all herbaceous 
plants, with the habit of Geum. 
B 
EXPLANATION. OF Tas. XXII. 
Fig. 1. A Branch of Cowania Mexicana. 
2. A Leaf, magnified. 
3. Calyx laid open to show the inside of the tube, and the 
| situation of the ovaria. ~ 
4. An Achenium surmounted by the persistent Style. 
5. The Embryo— natural size. - 
6. The same magnified. 
7. A Branch of Sieversia paradoaa. 
8. A Leaf of the same magnified. 
9. Achenium of the same. 
0. Embryo of the same magnified. 
XXIX. De- 
