156 CONVOLVULACKJB. 



11. PECTOCABYA, De CaadoUe. 



Nutlets forming an x-shaped bur, the wings undulate or laciniate 1, S 



Nutlets forming a flat +- shaped bur, the thin margins entire 3, 4 



1. P. linearis, DC. Wings of nutlets toothed, the teeth bristle-tipped. 



2. P. penicillata, A. DC. More diffuse: nutlets fiddle-shaped; apex bristly. 



3. P. setosa, Gr. Hispid, stouter: calyx -lobes with 3 or 4 very large bristles, 



4. P. pusilla, Gr. Strigulose: nutlets angular, flat, wingless, with a midnerve. 



CONTOLVCLACE.E. 



Twining or trailing: corolla fnnnelform, large, limb entire: stigmas 2.. 



Not twining: corolla 2-3 lines long, 5-cleft, white: styles 2 



Corolla i in. long, 5-cleft, purplish: stigmas 2 Sp. 7 in No. 



Twining leafless thread-like orange or yellowish stems: parasitic. 



1. CONVOLVULUS, Linnams. 



Solitary flower with a pair of broad bracts enclosing the calyx. 



Stems very short and erect or prostrate, trailing (See var. No, 5). 1, 3, 



Stems twining freely: bracts cordate-ovate or sagittate (See 5) 



Flowers often 2-3 together with small bracts; stems often woody 



Flowers with a pair of subulate bracts at base of pedicel: stamens slender 



Flowers 3 lines long, deeply 5-cleft: not twining 



1. C. Soldanella, L. Glabrous, fleshy: leaves renifonn: flowers pinkish. 



2. C. sepium, L., var. Americanus, Gr. Leaves acute: corolla rose, 



3. 0. Californicus, Choisy. Short, erect, or at length prostrate; pubescent. 



4. C. villosus, Gr. Densely white- velvety: leaves an inch long or less. 

 Var. fulcratus, Gr. Bracts similar to the leaves (hastate): corolla yellowish. 



D. C. occidentalis, Gr. Bracts variable: stems often very long: corolla white. 

 Var. tenuissimus, Gr. Only a ft. or a yd. high: leaves slender-hastate. 



6. C. arvensis, L. Creeping in moist places: corolla an inch long or leas* 



7. C. pentapetaloides, L. A diffusely branched slender annual with spatnlate - 

 lanceolate mostly entire leaves. This with No. 6 naturalized from En. 



2. CRESSA, Linnaeus. 

 1. 0. Cretica, L. Gray silky leaves numerous, small, entire: flowers axillary. 



3. CUSCUTA, Tournefort 



Ovary and capsule depressed glabose: stamens low, very slender ....,.-... 1, 



Ovary and capsule pointed; corolla withering-persistent: scales fringed. 



