144 Plante Lindheimeriane. 
of S. obtusifolius nor of S. maculatus, with which last espe- 
cially our plant should be critically compared. But Dr. Tor- 
rey informs me that these species want the bracts, so uncom- 
mon in Crucifere, and which so conspicuously distinguish S. 
bracteatus. 
394. Erysimom Arxansanum, Nutt. in Torr. & Gr. Fl. 1. 
p. 94; Gray, Gen. Ill. 1. t. 63. Wooded, rocky banks, &c., 
Comale Spring, and on the Guadaloupe. March, April. — A 
showy species, with large, deep, golden yellow, and faintly 
fragrant flowers. It was found on the Rio Grande by Mr. 
Wright. 
395. Vrssrcania ExegLMANI (Gray, Gen. Am. Bor.- Or. lll. 
1. p. 162, t. 70): perennis, pube lepidoto-stellata argentata ; 
caulibus e caudice sublignoso plurimis simplicibus erectis su- 
perne parce foliatis ; foliis inferioribus spathulatis seu oblance- 
olatis rariter repando vel sinuato-dentatis in petiolum attenu- 
atis, superioribus sublinearibus integerrimis; racemo etiam 
fructifero brevi ssepius corymbiformi ; silicula globosa glaber- 
rima breviter stipitata, 5—12-sperma (loculis. 8-ovulatis) 
stylo pergracili breviora; seminibus submarginatis; funiculis . 
septo longe adnatis. — Pebbly shore of the Guadaloupe, New 
Braunfels. May. Chiefly with mature fruit. (The same 
species, apparently, with elliptical and entire radical leaves; 
was found on the Upper Canadian, by Mr. Gordon.) From 
Lindheimer's seeds, this handsome and very distinct perennial 
species is in cultivation in the Cambridge Botanic Garden. 
It makes a strong, deep root. The clustered, simple stems 
rise to the height of a span or a foot, are clothed, like the 
foliage, with a silvery pubescence composed of dense and 
closely appressed stellar tufts, and are terminated by a short 
and dense, usually umbellif 1, raceme of golden yellow flow- 
ers, which are fully as large as those of V. grandiflora, the 
petals being half an inch long. Lower leaves two to three 
inches in length. The style is one third of an inch in length. - 
I should have adopted Dr. Engelmann’s or Lindheimer’s 
name of V. umbellata, under which the specimens were sent, 
