i82 CONVOLVULACEAE (MORNING-GLORY FAMILY) ' 



B. Leaves many, in whorls of 2-6, linear to lanceolate, 7-5~i5 cm- ^ong; corolla 

 lobes 4 mm. long. W. E. A. mezicana (whorled milkweed) 



BB. Leaves 6-8, opposite, rounded-ovate, 2.5-5 cm. long; corolla lobes 10 mm. long. 

 E. A. cryptoceras (dwarf milkweed) 



CONVOLVULACEAE (Morning-glory Family) 



Herbs. Stems prostrate or twining. Leaves none or mere scales, 

 alternate; stipules none. Flowers axillary, regular, the parts in 

 4's or 5's. Sepals persistent. Corolla limb entire or lobed. 

 Stamens as many as the corolla segments and alternate with them. 

 Ovary 2-6-celled; cells 1-2-ovuled; styles i or 2 or 4. Fruit a 

 capsule or sometimes fleshy. Seed large. 



A. Plants green, not parasitic; leaves ordinary, wide. CONVOLVTJLTJS (p. 182) 

 AA. Plants red or yellow, without green, parasitic; leaves mere scales. 



CUSCUTA (p. 182) 



CONVOLVULUS (Bindweed) 



Corolla campanulate to funnelform, somewhat 5-lobed or -angled at 

 margin. Stamens included. Capsule globose, 2-ceUed. Seeds usually 2. — 

 (L. convolvere = to entwine; they are twining plants.) 



A. Peduncles with 2 bracts just beneath the calyx and reaching or inclosing it; 

 stigmas linear to ovate. 

 B. Leaves somewhat cuneate at base; basal leaf-lobes small or none. W. 



C. calif omlcus 



BB. Leaves not at all cuneate at base. 



C. Leaves reniform, entire or with obscure angles, fleshy; stem trailing or creeping. 



W. C. soldanella (fleshy bindweed) 



CC. Leaves not reniform, distinctly angled, not fleshy; stem mostly twining. 



D. Leaf lobes at base entire; peduncles often 2-flowered. W. C. occidentalis 



DD. Leaf lobes at base from entire to 2-3-lobed; peduncles all i-flowered. E. 



C. sepium (hedge bindweed) 



AA. Peduncles without bracts near the calyx, but often with them farther down; 



stigmas filiform. W. E. C. arvensis (field bindweed) 



CUSGUTA (Dodder) 



Flowers small, whitish, in cymose clusters. Calyx 4-5-parted or -cleft. 

 Stamens in throat of corolla. Ovary globose, 2-celled. Seeds 1-4. — (The 

 Latin name.) Those growing on crop plants are bad weeds. 



A. Corolla scales fringed; stigmas capitate. 

 B. Capsule pointed. 



C. Flowers with pedicels; dry corolla enveloping the capsule; in fields and waste 

 places. E. C. indecora (pretty dodder) 



CC. Flowers subsessile; dry corolla not enveloping the capsule; in salt marshes 

 along the coast. W. C. squamlgera (salt-marsh dodder) 



BB. Capsule globose. 



D. Flowers sessile; style shorter than ovary. E. C. arvensis (field dodder) 

 DD. Flowers with pedicels; style as long or longer than the ovafy. 



