102 JVofi'ces of neio and beautiful Plants 



Those who wish to see the generic and specific distinctions 

 complete, must consult the above work. 



JYew J^ortli American plants described in the fourth volume 

 of the Jlnnals of the New York Lyceum of Natural History: — 



Cruciftracece. 



LEAVENWO'KTHM (In honor of Dr. M. C. Leavenworth, of the U. S. nrmy, an indi fali- 

 gnblR hotani-it, vvlm his l:ir!;ely contributed to our knowledge of the plants of Arkansas, 

 Louisiana and Flnrida Torrcij.) 



Generic character. Calyx, somewhat erect, equal at the base. 

 Petals, equal, cuneiform, truncate or emarginate. Filaments, 

 distinct, toothless. Silique, sessile, oblong, linear, somewhat 

 inflated and torulose; valves indistinctly nerved. Style, distinct, 

 or almost wanting. Stigma, minutely bidentate. Seeds, in a 

 single series, flattened, with a broad winged margin. Funi- 

 culus, free. Embryo, nearly straight, or with the radicle some- 

 what bent on the cotyledons: the radicle very short, conical, 

 pointing obliquely upwards, towards the hilum. Cotyledons, 

 orbicular. Dissepiment, 1-nerved, minutely reticulated; the are- 

 olce transversely linear-oblong. Herbaceous, annual: flowers 

 on long subradical peduncles, or in loose racemes, yellow. 



L. a urea Torrey 



Root, straight. Plant, 2 — 6 inches high. Leaves, mostly 

 radical. Racemes, 4 — 10 flowered. Flowers, in the young 

 plant, solitary, on long, erect, naked peduncles; in advanced 

 specimens, racemose. Petals, yellow, tapering to a long cune- 

 ate base. Stamens, distinct. Ovarium, sessile, oblong. Si- 

 lique, rather more than an inch long. Dissepiment, thin and trans- 

 parent. Seeds, usually 5. 



This species inhabits wet places on the prairies, in the vicinity 

 of Fort Towson, Arkansas: also in Texas, and in Jefferson 

 County, Alabama, where it was observed by Dr. Leavenworth. 

 Of only botanical interest. 



L. Michaiixit Torrey 



Syn: Cardamine uniflora Michx.l Fl. Bor. Am. II, p. 29; 

 Pursh, Fl II, p. 439, D. C! Syst. II, p. 251. 



Found on rocks about Knoxville, Tennessee Michx.! v. s. in 

 Herb. Mus. Paris. On wet rocks, Kentucky; very rare Dr. 

 Short. I 



Extremely similar to the L. aurea, but appears to be distinct. 

 Resembles it in the form and size of the leaves and flowers. 

 The style, however, is very evident in the latter, but is always 

 wanting in Michauxit. 



Dr. Torrey states that this is the only species of this family 

 with which he is acquainted, in which the embryo (except in its 

 earliest state,) is straight. Thus, according to De Candolle, 

 the plant cannot be referred to either of his great suborders of 

 Cruciferaceas, Pleurorhizse and Nortorhiza;. Respecting the 



