264 CEASSULACEiE. 



1. CALLITRICHE. L. 



The only genus. (Greek kallos, beautiful, and trichos, a hair, on 

 account of the slender stems.) 



Fruit sessile ; flowers 2-bracted ; submerged leaves retuse or bifid at apex . 



1. C. palustris. 

 Fruit on a pedicel 2 to 5 lines long; flowers bractless; leaves not notched at 

 apex . . . , . . 2. "C. marginata. 



1. C. palustris L. Water Fennel. Aquatic; stems 5 to 10 

 in. long; submerged leaves narrowly linear, 1-nerved, notched at the 

 apex, 7 to 10 lines long; emersed or floating leaves obovate, narrowed 

 at base into a slender petiole, 2 to 6 lines long; fruit obovate, 

 flattened, notched at apex, J to 1 line long; each lobe sharply winged 

 on the back for its whole length, the proximate lobes with a groove 

 between them. 



Cold pools or slow streamlets. Napa Valley; Marin Co.; G-ilroy.' 

 Mar.-May. 



2. C. marginata Torr. Stems 2 to 4 in. long, forming dense 

 mats in the moist beds of vernal pools from which the water has 

 disappeared; leaves oblanceolate, 2 or 3 lines long; plants sometimes 

 submersed and the leaves linear; bracts none; styles long, reflexed, 

 soon deciduous; fruit rather less than i line long, broader than long, 

 notched both at apex and base, the lobes sharply winged; fruiting 

 pedicels 2 to 5 lines long. 



Stanislaus and San Mateo Cos. (aoc. to Bot. Cal.), northward to 

 Napa Valley and Sonoma Co. 



60. CRASSULACE/E. Stone-crop Family. 



Succulent herbs with entire exstipulate leaves. Flowers In cymes, 

 small, perfect and regular. Sepals, petals and pistils of the same 

 number (in ours 4 or 5), and the stamens as many or twice as many. 

 Petals generally slightly perigynous, distinct or united at base. 

 Fruit a dry many-seeded follicle. Eeceptacle usually with nectar- 

 bearing scales on the receptacle, one behind each pistil. 

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



1. TiLLffiA. 



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

 as the petals. 

 Perennials or annuals; petals distinct; follicles spreading when fully 



ripe 2. SEDtm. 



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

 follicles erect or suberect ... . .... 3. Cotyledon. 



1. TILL/EA 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 1 to several-seeded, the seeds 

 striate longitudinally. (Michael Angelo Tilli, Italian botanist.) 



