CONVOLVULACER 91 
11. PECTOCARYA, DeCandolle. 
Nutlets forming an x-shaped bur, the wings undulate or laciniate.........esesee. 1, 2 
Nutlets forming a flat +-shaped bur, the thin margins entire........-.++.+.0 o. 84 
1. P. linearis, DO. 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, 
& P. pusilla, Gr. Strigulose: nutlets angular, flat, wingless, with a midnerve. 
CONVOLVULACER. 
Twining or trailing: corolla funnelform, large, limb entire: stigmas 2.........+.--06 oe l 
Not twining: corolla 2-3 lines long, 5-cleft, white: styles 2........... cece cceeeeceee 2 
Corolla 3 in. long, 5-cleft, purplish: stigmas 2.............0..-0-ee00e ...Sp. 7 in No. 1 
Twining leafless thread-like orange or yellowish stems: parasitic............eseee008 .8 
1 CONVOLVULYS, Linnzus. 
Solitary flower with a pair of broad bracts enclosing the calyx. 
Stems very short and erect or prostrate, trailing (See var. No. 5).......6 1, 3,4 
Stems twining freely: bracts cordate-ovate or sagittate (See 5).... ........0005 2 
Flowers often 2-3 together wlth small bracts; stems often woody...........0....0008 5 
Flowers with a pair of subulate bracts at base of pedicel: stamens slender............ 6 
Flowers 3 lines long, deeply 5-cleft: not twining............ 0... cece e enc en eee 7 
1. C. Soldanella, L. Glabrous, fleshy: leaves reniform: flowers pinkish. 
2. C. sepium, L., var. Americanus, Gr. Leaves acute: corolla rose, 
3. ©, Californicus, Choisy. Short, erect, or at length prostrate; pubescent, 
4, CG. villosus, Gr. Densely white-velvety: leaves an inch long or less, 
Var. fulcratus, Gr. Bracts similar to the leaves (hastate): corolla yellowish. 
5. 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 less, 
7. C. pentapetaloides, L. A diffusely branched slender annual with spatulate or 
lanceolate mostly entire leaves. This with No. 6 naturalized from Eu. 
2. CRESSA, Linnzns. 
1. ©, Cretica, L. Gray silky leaves numerous, small, entire: flowers axillary, 
3. CUSCUTA, Tournefort. 
Ovary and capsule depressed glabose: stamens low, very slender..... scccecvecscen'ly D 
Ovary and capsule pointed; corolla withering-persistent: scales fringed. 
