262 On New Genera and Species of Nyctaginacea. 
except Pisonia. The position of this genus is evidently between 
the preceding and the following. ~ ° 
SELINOCARPUS, Nov. Gen. 
Involucrum nullum. Perigonum (perfectum) cyathiforme, vel 
infundibulari-tubulosum, limbo 5-angulari. Stamina 2 seu | 
mox exserta. Stylus filiformis: stigma peltatum leve. Fructus 
5-alatus (vel abortu 3-4-alatus), alis scariosis aveniis. Embryo 
conduplicatus, albumen farinosum includens; cotyledone inter- 
ori minore. Herb humiles (vel suffruticuli), e radice tuberosa 
seu lignescente multicaules; foliis oppositis subineequalibus alter- 
nisve petiolatis ; floribus terminalibus vel pseudo-axillaribus 
sepius geminatis vel fasciculatis; bracteolis 1-3 subulatis min 
mis seu abortivis. 
The fruit of these plants much resembles that of certain Um- 
belliferze, such as Cymopterus and Selinum (whence the name). 
Much of it is produced from flowers precociously fertilized in the 
bud, as in all the allied genera. Besides the two subjoined spe- 
cies, there is ome with suffruticose stems in the late Dr. Gregg’s 
Mexican collection; but my specimen is too imperfect for de- 
scription. 
1, Se.inocarrus pirrusus (sp. nov.): pube hirtella subvisco- 
liis ovatis seu ovato-oblongis obtusis; floribus seepius gemunalis 
subsessilibus ; tubo perigonii evoluti elongato (sesquipollicari) ; 
and tufted. The flowers, when geminate as well as when soli- 
tary, are each subtended by 2 or 3 small and subulate bractlets, 
which therefore do not properly represent an involucre. 4% 
unopened perigonium of the precociously fructified flowers 
which usually persists until the fruit is ripe, does not ex 
line in length ; while the fully developed flowers are an inch 
ahalf long. The fruit from the two kinds of flowers is Just © 
same: it is three lines long, broadly oval in circumseription; 1 
cluding the wings, which are as wide as the body. 
entirely veinless, and almost wholly consist of parallel, vet 
and filiform cells, which, on being torn asunder in water, 
attenuated gelatinous threads. 
2. Seuinocarpus cHENoPopioIDEs (sp. NOV. )y pulveralento 
“baie subcinereus ; caule erecto ramoso ; foliis late ovatis 
subcordatis repandis longe petiolatis demum glabratis; 
cymuloso-fasciculatis pedicellatis parvis ; perigonio etialn ev 
brevi, cyathiformi, tubo subnullo; staminibus 2,—Valleys neat 
Providence Creek to the Rio Grande, New Mexico ; als? 
y long 
