412 



THE KINDS OF PLANTS 



white, opening once at night, with a slender tube and a large limb 4-6 in. 

 Tropical America. Perennial. 



I. purpurea, Roth. Morning-glory. Fig. 240. Leaves 

 broadly cordate-ovate, entire: flowers 2-4, large and fun- 

 nel-shaped, 2-3 in. long, purple to streaked and white. 

 Tropical America. Annual. 



I. hederacea, Jacq. Leaves heart-shaped, 3-5-lobed: 

 flowers 1-3, rather smaller than those of /. purpurea. 

 Tropical America. Annual. 



I. Batatas, Poir. Sweet potato. Fig. 204. Creeping: 

 leaves heart-shaped to triangular, usually lobed: flowers 

 (seldom seen) 3 or 4, light purple, funnel-form, 1J^ in. long. 

 Tropics; grown for its large edible root-tubers. 



552. Ipomcea 

 Bona-Nox. 



2. CONVOLVULUS. BINDWEED. 



Herbs (or shrubs) twining or erect: flowers large, on axillary peduncles; 

 sepals 5; corolla funnelform or bell-form, limb entire, 5-angled or 5-lobed; 

 stamens inserted on corolla-tube, included; style 1; stigmas 2, long; ovary 

 and pod 2-celled, 4-seeded. 



C. sepium, Linn. Rutland beauty. Perennial: twining or trailing stem: 

 leaves heart-shaped or arrow-shaped, auricles often toothed: flowers axil- 

 lary and solitary on a peduncle; calyx with 2 large bracts at base, inclosing 

 it; corolla morning-glory-like, white or pink, M~2 in. long, margin quite 

 entire. Wild in low grounds. Summer. 



C. arvensis, Linn. Bindweed. Perennial, nearly glabrous, prostrate or 

 climbing: leaves entire arrow-shaped, with basal ears acute-lobed, but vari- 

 able: calyx not bracted at base; corolla pink, nearly white, small, 

 not over 1 in. long. Europe. Bad weed. May to September. 



3. CUSCUTA. DODDER. 



Parasitic twiners without foliage (leaves reduced to scales): 

 flowers in clusters, the calyx and corolla with 4-5 lobes: fruit 2- 

 loculed, 4-seeded. 



C. Gronovii, Willd. (Fig. 553), is the commonest species, 

 twining its slender coral-yellow stems over coarse 

 herbs in swales: corolla bell-shaped, the tube longer 

 than the blunt and spreading lobes. 



XXXVIII. BORRAGINACE^. BORAGE FAMILY. 



Generally rough herbs, with round stems, leaves 

 usually alternate and hairy, exstipulate: inflores- 

 cence commonly 1 -sided, in coiled terminal racemes, 

 straightening as flowers open; lobes of calyx 5: lobes 

 of corolla 5, usually regular; stamens 5, on corolla- 



553. Cuscuta 

 Gronovii. 



