Geology and Natural History. 377 
Of the Senna sub-genus,—known by the pods never opening 
elastically, the seeds on slender stalks, and the shoal ue of the 
anthers glabrous—we have at most fourteen species, 
I, With short and turgid pod, no gland on base of ag (all 
exano-Mexican species), and 
(1.) A single pair of leaflets, 
eu 0. ey? Gray: very dwarf; leafiets linear, and peduncle one- 
ow pe 
riana Scheele: less dwart; leaflets lanceolate, smooth- 
ish, ag Sdhanils few-flowere 
; O. bauhinioides Gray: dwarf; leaflets it and ovate-oblong, 
owny. 
(2.) Two or more pairs of Silas high leaflets: soft-downy plants, 
2 feet high or 
C. Covesit Gray (omitted by Beuthia am, ee almost certainly C. 
crotaluriodes Kunth): with 2 or 3 pairs of leaflets, and pubescent 
ardly an inch long. 
CU. Lindheimeriana Scheele: with 5 or 6 pairs of leaflets, and 
a longer pod. 
C. eee L. aerate on our southern borders: has 4 or 
5 pairs of ovate or ovate-lanceolate acuminate ee and thickish- 
inches 
sessile a clusters, and a broadish linear flat pod, 3 
ng. 
(a. ligustrina L., a West-Indian species. of this group, with 
n ore termin y 
smooth ast; 3 or 4 inches long, we still suppose is wrongly 
nited States. We have, stad cultivated ie. 
said to come from Louisiana and Texas, of C. levi, 
ct known, in flower, by the fewer leaflets, with guste between 
(2.) No gland on the petiole, one between each pair of leaflets or 
he 
v oC. Tor a L., to which is joined C. obtusifolia L., the common 
merican form: annual herb, ics oe three pair 
h nen mensis Mill., which occurs on the Florida page ens 
as been referred to C. angustisiliqua Lam. (which is a form o 
