252 Engelmann and Gray, 
upper surface of which is excavated. . The membranaceous 
cusps of the anther are triangular acute, and partly cover the 
very obtusely 5-angular and somewhat convex stigma. The 
- small horizontal pollen-masses are oblong, slightly curved, and 
scarcely attenuated at the exterior (attached) end. — From 
the description, there can be little doubt that this plant is a 
congener of Chthamalia biflora, and C. pubiflora, Decaisne, 
in DC. prodr., from which it differs in the glabrous corolla, 
etc. ; but surely it cannot be separated from Gonolobus, as that 
genus is left by Decaisne. The corona of Gonolobus, charac- 
terized as * annuliformis undulato-lobata, lobis integris prom- 
inentibus," exhibits great diversities in the admitted species, 
from the proper annular and 5-lobed crown of G. levis, to 
the campanulate one, with 10 long subulate and 5 short trian- 
gular teeth, of G. macrophyllus and G. hirsutus. 
_ 914. Evsroma RussELLIANUM, Don, Griseb. . e wet 
prairies. July — August. 
. 815. Raog Bicis, Hook. Sandy soil, near r water 
rses. 
96. ConvoLvoLUS (Srviasua) PickERINGII, Tore. Dry; 
sandy prairies. May — July. — Specifically distinct, we sus- 
pect, from the C. tenellus, Lam. to which Choisy joins it.' 
911. Cuscura cuspmara B. . Vidé No. 195, supra. i Bot- 
tom lands of the Colorado River. August. - ~ 
. $278. Lirnosrermum Brevirtorum (n. sp.) : caulibus soli- 
tariis, vel- plurimis e radice nigro-purpurea fusiformi erectis 
apice ramosis, foliisque linearibus lineari-lanceolatisve margine 
revolutis utrinque strigoso-canescentibus ; floribus s 
latis; corolla calycis lacinias lineares strigosas viX equante 
fauce exannulata, lobis erectis (an semper ) minutissume 
crenulatis ; nucibus albidis UK ovatis acutis, intus acute 
-1 The htio also comprises a few specimens of Convolvulus hasta : 
in Trans. Am. Phil. Soc. (n. ser.), V. p. 174: which name, being several times pre- 
ipie |, we propose for it the name of C. tosATvs. Sandstone rocks, near vui 
May, June. Stems prostrate, 8-4 feet Met Flowers rather. small, white. - 
Wright has also s nti Som the Colorado. te ee 
Sie 
