CRASSULACEAE. 195 



Leaves opposite; the stamens as many as the petals; diminutive annuals 1. Tillaea. 



Leaves alternate, the basal in conspicuous rosettes; stamens twice as many as the petals. 



Perennials or annuals; petals distinct; follicles often spreading when fully ripe 



2. Semjm. 



Perennials, coarser than the last; petals more or less united at base; follicles erect or 



suberect 3. Cotyledon. 



1. TILLAEA L. 



Small and slender glabrous annuals with opposite leaves. Flowers minute, 

 axillary, white or pinkish. Sepals and petals 3 to 5 (in ours 4), distinct or 

 united at base, the stamens as many. Pistils distinct, with almost obsolete 

 styles. Follicles 4, 1 to several-seeded, the seeds striate longitudinally. 

 (Michael Angelo Tilli, Italian botanist.) 



Flowers clustered; petals broadly subulate; follicles 1 to 2-seeded 1. T. minima. 



Flowers solitary; petals oblong; follicles several seeded 2. T. drummondii. 



1. T. minima Miers. Simple or with several ascending or erect branches, 

 % to 3 in. high; herbage of the adult plants reddish; leaves ovate or oblong, 

 obtuse, 1 line long; flowers axillary, subsessile or occasionally on pedicels 1 

 or 2 lines long; sepals equaling the broadly subulate petals; follicles 1 to 2- 

 seeded. 



Common on finely disintegrpted sandstone or other rock, from Solano Co. 

 and Sonoma to Berkeley and Marin Co. and southward. Mar.-Apr. 



2. T. drummondii T. & G. Stems very slender, dichotomous, decumbent 

 and rooting at some of the lower nodes, 1 in. long or more; leaves linear-oblong, 

 acute, 1 to 2 lines long ; flowers subsessile ; petals oblong, white, 2 to 3 times the 

 length of the calyx-lobes; carpels obtuse. 



Moist places in the lower Sacramento Valley. Mar. -May. Var. bolanderi 

 Wats. Stems 3 in. long; leaves 2 lines long; pedicels elongated in fruit (6 

 lines long). — San Francisco. May. 



2. SEDUM L. Stone Crop. 

 Fleshy glabrous herbs, erect or decumbent, with alternate leaves. Flowers 

 pale yellow or white, in terminal often 1-sided cymes. Calyx divided nearly to 

 the base into 4 or 5 sepals. Petals distinct. Stamens perigynous, the alternate 

 ones usually attached to the petals. Pistils distinct, rarely united at the base, 

 becoming few to many-seeded follicles, diverging when ripe; styles usually 

 short. (From the Latin sedeo, to sit, on account of the lowly habit.) 



Basal leaves in rosettes; perennial. 



Leaves thick, not nerved 1. S. spathuhfohum. 



Leaves comparatively thin, very obviously nerved when dry 2. 5. radiatum. 



Leaves all scattered, 1 to 2 lines long; annual 3. 5. pumilum. 



1. S. spathulifolium Hook. Glaucous; leaves flat, obovate or spatulate, 

 obtuse, 5 to 9 lines long, either condensed in small somewhat depressed rosettes 

 which are sessile on the caudex or on its prostrate branches, or sessile on the 

 flowering branches, the latter rather smaller; flowering stems ascending, 4 to 

 6 in. high; flowers on short pedicels or sessile, 3 lines long, yellow; petals 

 lanceolate, acute, twice longer than the ovate acute sepals, scarcely exceeding 

 the stamens and style. 



Common on rocky walls on the north or shady side of canons: Mt. Diablo; 

 Oakland Hills and northward. 



2. S. radiatum Wats. Perennial; stems several, simple or branching, 

 from a slender rootstock, 4 to 6 in. high; cauline leaves oblong to oblong- 

 ovate, acute, sessile by a rather broad base, 3 to 5 or 6 lines long, nearly or 



