388 



COXVOLVULA( )EM. 



coast flowering until Nov. Passing into C. occidentalis Gray of 

 Southern California in which the bracts are larger and enclose the 

 calyx. 



Var. Solanensis. Largest leaves 2J in. broad, almost triangular, 

 the lateral margins from the outer angle of the lobes to the apex 

 nearly straight; basal lobes shallowly sinuate. — Vaca Mountains. 



Var. purpuratus Greene. Limb of corolla rose-purple, varying 

 to white on the same plant. — Angel Island; Marin Co.; Presidio, San 

 Francisco. 



6. C. arvensis L. Common Bindweed. Perennial; herbage 

 minutely villous-pubescent or almost glabrous; stems prostrate, 1 t<> 

 several ft. long, from roots which descend to great depth; leaves 

 oblong- or triangular-sagittate, 5 to 1 or 2 in. long, on petioles A 

 as long; peduncles commonly 1 (sometimes 2 or 3)-flowered, with a 

 pair of subulate or spatulate bracts near the middle; corolla white, 

 purplish outside, neither lobed nor angled, 1 to 1 J in. broad. 



The most troublesome weed yet naturalized in California, especially 

 vexatious to horticulturists and vineyardists. Flowering from May 

 through the summer and autumn. 



7. C. pentapetaloides L. Diffusely branched from the base, the 

 branches b' to 18 in. long, puberulent or hairy; leaves linear or oblong- 

 oblanceolate, narrowed to a petiole, 1 to 3 in. long; peduncles with a 

 pair of small spatulate or subulate bracts below the flower. 1-flowered, 

 retrocurved in fruit, ^ to 1 in. long; sepals more or less hairy with 

 subscarious margin; corolla purplish, 3 lines long, deeply o-cleft. 



Naturalized from Europe: Lower San Joaquin Valley; Antioeh, 

 Mrs. Cwrrtm, June, 1884; Estrella, Jeered. 



3. CRESSA L. 



Low canescent perennial herb with erect or diffuse non-twining 

 stems. Sepals 5, nearly equal. Corolla white, its tube oblong- 

 campanulate, equaling the sepals; limb 5-parted into lightly convo- 

 luted mbricate lobes which are somewhat induplicate in the bud. 

 Filaments filiform, exserted from the throat of the corolla: ovary 

 2-celled, 4-ovuled. Capsule by abortion often 1-seeded. (Greek 

 Kressa, a Cretan woman.) 



1. C. Cretica L. Commonly densely branched from the base, 

 forming low tufted plants 3 to 6 in. high; leaves oblong-ovate, 2 to 4 

 or 5 lines long, almost sessile; flowers short-pediceled in the axils; 

 sepals oblong-ovate, acute, 2 lines long; corolla-lobes oblong-ovate; 

 ovary long-hairy. 



Alkaline lands from near Vacaville southward, especially common in 

 the San Joaquin Valley, often covering thousands of acres. May. 



4. CUSCUTA L. Dodder. 

 Annual parasitical leafless herbs, destitute of green color, with 

 twining filiform stems. Flowers small, in lateral heads or clusters. 

 Calyx colored like the corolla, deeply 5-cleft. Corolla campanulate 



