to the Rocky Mountains. 167 



Obs. There was but one imperfect specimen of this plant 

 in the collection, so that I was unable to compare it with S. 

 pinnatifida. It appears to be very near the S. amplexifolia 

 of Nuttall. (Plants of Florida, in Sill. Jour, v. p. 297.) 



CAPPARIDEiE. 



22. Peritoma serrulatum, DC. prod. i. p. 237. Cle- 

 ome (Atalanta) serrulata, Nutt. gen. ii. p. 73. C. serrulata, 

 Pursh,fl. ii. p. 441. 



Obs. Mr. Nuttall's name for this genus was changed by 

 De Candolle, as the Atalantia of Correa, ann. mus. vi., was pub- 

 lished first. 



23. Polanisia graveolens, Raf. in j 'our ■. phy s . 1819. p. 

 98. DC. prod. i. p. 242. Cleome dodecandra Pursh non 

 Lin. 



24. Cleomella mexicana, DC. prod. i. p. 237. 



Desc. Stem herbaceous, branched, smooth, and unarmed ; branches 

 obtusely angular. Leaves ternate, petiolate, very smooth ; petioles about 

 an inch long, with several very minute stipules at the base ; leaflets lan- 

 ceolate, very entire, rather acute. Flowers in terminal corymbose race- 

 mes, on filiform pedicels, yellow. Sepals 4, acuminate, lanceolate, smooth, 

 coloured. Petals 4, cruciate, nearly equal, unguiculate, oblong, obtuse. 

 Stamens 6, subtetradynamous, somewhat declinate, distinct at the base, in- 

 serted into a subglobose torus ; filaments slender ; anthers linear, revolute. 

 Germen stipitate, oblong ; style filiform, much longer than the stamens ; 

 stigma simple. Capsule supported on a long stipe, obtusely triangular, 

 very broad, compressed, truncate ; lateral angles rounded, 1 — celled 2— 

 valved ; valves much compressed, membranaceous, not carinate, dehiscent. 

 Placentas 2, between the valves, each tkree-seeded. Seeds subreniform ; 

 funiculus free ; embryo incurved. 



Obs. This plant is evidently one of the Cleomea?, of the 

 order Capparideae. Except in the leaves it has much the 

 aspect of an Iberis, and would appear to belong to the Cru- 

 ciferae. 



The Cleomella is not described by Kunth in his account of 

 the plants collected by Humboldt and Bonpland. 



