i110 
TETRANDRIA. TETRAGYNIA. 
Small herbs; flowers nearly solitary, terminal and axil- 
lary, upon long peduncles, petals often caducous. 
Species. 1. S. procumbens.—An European genus. 
165. TILLABA. L, 
Calix $ or 4-parted. Petals 3 or 4, equal. 
Capsules 3 or 4, two or many-seeded. Stamina 
sometimes 8, 4 sterile. 
Small succulent herbaceous plants, allied to Crassula 
and Sedum; leaves opposite, rarely ternate; flowers mi- 
nute, axillary, cymose, or umbellate. 
Spceies. 1 T?*cymosa (Sedum pusillum, M1cn.) Erect; 
stem verticillately or trichotomously branched from the 
base; leaves alternate, almost cylindric, oblong; flowers 
subdichotomously cymose, alternate and pedicellate, oc- 
tandrous; capsules connate, 2 to 4 seeded, opening eX- 
ternally. a P ee. 
Annual. Two to 4 inches high, “ flowers white, octan- 
drous,” Micu. Capsules 4, united, never separable, with 
subulate and at length long mucronate points, opening on 
the under side. Seeds germinating as soon as they fall, 
the young plants remaining green throughout the winters 
in these the leaves are oval-oblong and succulent. Branch- 
es abuut 4 from the same point—Collected in winter on 
the “* Flat-Rock,” above Camden in North Carvlina, grow- 
ing with mosses in the wet and gravelly excavations of 
the rock, in the same place where it was discovered by 
Michaux, and hitherto found in no other spot, as Mr. 
Pursh evidently confounds this plant with the S$ pulchel- 
lum, when he speaks of its growing on the east banks of the 
Shenandoah river m Virginia, the latter being there suf- 
ficiently abundant, and yet he quotes the remote Habitat 
_ of Michaux, “on rocks around Knoxville,” (Tennessee) 
and indicates by his mark (+) that he has never seen S. 
_ pouchellum, notwithstanding its prevalence around Har- 
per’s Ferry, &c. &c. in Virginia. 
‘Having never seen this plant in flower, I am unable to 
ascertain its genus; it is, however, at the same time much 
more nearly related to Tillea, than to Sedum. In the struc- 
ture of the capsule it entirely diffe-s trom every other 
plant in the Natural Order Sempervive: ~ : 
Of Tillea there are in America besides the above, ~ 
species in Peru, 4 i and 4 at the Cape of 
Good Hope. “=e = 
