110 TETRANDRIA. TETRAGYNIA. 



Small herbs; flowers nearly solitary, terminal and axil- 

 lary, upon long peduncles, petals often caducous. 

 Species. 1. S^procwnbens. — An European genus. 



165. TILL^A. L. 



Calix 3 or 4-parted. Petals 3 or 4, equal. 

 CapsiUes 3 or 4, two or many- seeded. Stamina 

 sometimes 8, 4 sterile. 



Small succulent herbaceous plants, allied to Crassiila 

 and Sedvm; leaves opposite, r u'ely ternate; flowers mi- 

 nute, axillary, cymose, or umbeilate. 



Spcetes. 1 T?*cymosa (SedumpusiUnmy Mi cn.)'Evecti 

 stem verticillately or trichoiomoubi'- branched from the 

 base; leaves aliernate, almost cylindric, oblong-; flowers 

 subdiciiotomously cymose, altt mate and pedicellate, oc- 

 tandrous; capsules connate, 2 to 4 seeded, opening ex- 

 teriially. 



Annual. Two to 4 inches hi.^h, ** flowers white, octan- 

 drous," Mich. Capsules 4, united, never separablt- , with 

 subulate and at length long mucronate ponts, opening on 

 the under side. Seeds germinating as soon as they fiill, 

 the young plants remaining green throughout the winter, 

 in these tne leaves are oval-oblong and succulent. Branch- 

 es about 4 from the same point — Collected in winter on 

 the " Flat-Rock,*' above Camd n in Nortli CarwUna, grow- 

 ing with mosses in the wet and graveliy excavations of 

 the rock, in the same place where it was discovered by 

 Michaux. and hitherto found in no other spot, as Mr. 

 P ■••■ih evidently confounds this plunt W"th the S pidchel- 

 lum, when he speaks of its growing on the east banks of the 

 Shenandoah river m Virginia, the laiter being there suf- 

 ficiently abundant, and vet he quotes the remote habisat 

 of Michaux, ''on rocks around rsnowille,** (Tennessee) 

 and indicates by his mark (-^ ) that he has never seen S. 

 p7//cAe^/?/7n, 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 he same time much 

 more near'y related to Tilliea, than to Sfdum In the struc- 

 ture of the capsule it eut.relv differs .torn every other 

 plant in the Natural Order Sempervivce 



Or TiUxa there are m America ^^esides the above, 1 

 species m Peru, 4 also in Europe, and 4 at tlie Cape of 

 Good Hope. 



