﻿116 PLANTS FENDLERIANjE. 



Rudbeckia? Porteri, p. 83 (note), has been found anew by H. W. Ravenel, Esq , during the past sum- 

 mer, in the mountains of Georgia. A capitulum, just received in a letter from my friend Mr. Curtis, exhibits 

 the fructiferous disk considerably prolonged, and the ripe achenia short and thick, obscurely quadrangular. 



The subjoined is a Cruciferous plant which was not received in time to be noticed in the proper place : — 



/ SYNTHLIPSIS, Nov. Gen. Crucif.-Thlaspid. 



/ Calyx basi subajqualis, sepalis linearibus laxis. Petala obovata, ungue lato. Discus hypogynus inter petala 

 et stamina annularis, contorto-undulatus. Filamenta edentula, filiformia. Ovarium oblongum, multiovulatum, 

 stylo gracili brevius : stigma depresso-capitatum. Silicula septo contrarie compressa, oblongo-elliptica, emar- 

 ginata (vel immatura leviter obcordata) ; valvis navicularibus acutissime carinatis, apteris, apice tantum mar- 

 ginato-subproductis ; septo lato-lineari uninervi. Semina in quovis loculo 8-10, biserialia, e funiculo libero 

 pendula, orbiculata, compressa, immarginata. Cotyledones plana?, septo contraria;, radicular adscendenti cari- 

 nam valvarum spectanti accumbentes. — Herba ramosa diffusa, pube stellata canescens; foliis sinuato-pinnati- 

 fidis ; racemis laxis; floribus ut videtur roseis ; pedicellis fructiferis patulis vel recurvis. 



S. Greggii. — Valley near Saltillo, Coahuila, January 4, 1847, Dr. Gregg. — Root and radical leaves not 

 seen. Stem apparently low, diffusely branching, rigid ; the branches, like the whole plant, whitened with a close 

 and fine stellate pubescence, leafy. Leaves oblong, coarsely sinuate-toothed or pinnatifid ; the lower narrowed 

 into a petiole ; the others almost sessile. Petals 3 lines long, evidently tinged with purple or rose-color. Pods 

 4 or 5 lines long, and 2 lines or a little more in width, canescent, about the length of the pedicel, flattened 

 contrary to the narrow septum, pretty strongly emarginate at the apex, tipped by the slender style ; the com- 

 pressed-navicular one-nerved valves sharply carinate, but the keel scarcely if at all margined, except at the 

 apex, where it is manifestly produced. — The specimen upon which this evidently new genus is founded 

 occurs in a collection by Dr. Gregg, long since forwarded to me by Dr. Short, but which has only now come 

 to hand. Although the genus must be referred to the Thlaspideae, its nearest affinity is with Vesicaria through 

 the Mexican V. argentea, Schauer (which I have in fruit from Coulter's Mexican collection, no. 691), in 

 which the silicle is evidently somewhat compressed contrary to the elliptical septum, but the cotyledons are 

 still parallel with it; and with Physaria (vide Gray, Gen. III. 1. p. 162) through P. Geyeri (Vesicaria Geyeri, 

 Hook.), in which, moreover, the seed hangs with the cotyledons contrary to the septum, as in the present genus. 

 It is also allied to the Californian Lyrocarpa, Hook. i$- Harv. In aspect it bears considerable resemblance to 

 the Dithroea Wislizeni of Engelmann ; — a flowering specimen of which, gathered by Mr. Gordon, near the 

 sources of the Canadian, exhibits a pair of ovules in each cell. The name, aivffktfyis, compression, alludes 

 to the character of the pod which distinguishes the genus from Vesicaria and Physaria. 



Dr. Gregg's collection also contains specimens, gathered "west of Parras," of a canescent plant with 

 much the habit of Synthlipsis Greggii, but with linear-oblong pods (siliques rather than silicles), a cordate- 

 capitate stigma, &c. : but the immature seeds seem as if the cotyledons would be incumbent. Better materials 

 are requisite for its proper determination. 



».* Page 63, line 19, for no. " 348" read 342. 



(To be continued.) 



Published, February 10, 1849. 



