di 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. 
274. Evsroma Russeuuianum, Don, Griseb. Clayey, wet 
prairies. July — August. 
275. Puitox Drummonpit, Hook. Sandy soil, near water 
courses. 
276. Convotvutus (Sryuisma) Picxerineu, Torr. Dry, 
sandy prairies. May — July. — Specifically distinct, we sus- 
pect, from the C. tenellus, Zam. to which Choisy joins it.’ 
277. Cuscuta cuspipata $8. Vide No. 125, supra. Bot- 
tom lands of the Colorado River. August. 
278. LirHosPERMUM BREVIFLORUM (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 subpedicel- 
latis; corolla calycis lacinias lineares strigosas vix equante 
fauce exannulata, lobis erectis (an semper?) minutissime 
crenulatis; nucibus albidis nitidis ovatis acutis, intus acute 
1 The collection also comprises a few specimens of Convolvulus hastatus, Nuit. 
in Trans. Am. Phil. Soc. (n. ser.), V. p. 174: which name, being several times pre- 
occupied, we propose for it the name of C. topsarus. Sandstone rocks, near Industry- 
May, June. Stems prostrate, 8-4 feet long. Flowers rather small, white. Dr, 
Wright has also sent it from the Colorado. 
