CONVOLVULACEAE 965 



8. JACQUEMONTIA Choisy. 



Annual or usually perennial trailing or twining vines, or upright herbs or shrubs. 

 Leaves alternate : blades entire or rarely toothed or lobed. Flowers usually in loose or 

 congested cymes, these sometimes conspicuous on account of densely pubescent bracts. 

 Sepals nearly equal, or the outer much broader than the inner. Corolla white, blue or 

 violet, companulate : limb plaited, 5-angled or 5-lobed. Stamens 5, not surpassing the 

 corolla. Filaments filiform or dilated at the base, adnate to the base of the corolla-tube. 

 Ovary 2-celled. Styles united to the stigmas. Ovules 4, 2 in each cavity. Capsule sub- 

 globose, 4-valved. Seeds glabrous. The plants flower mainly from spring to fall. 



Bracts and calyx glabrous, at least not conspicuously pubescent. 



Leaf-blades acuminate or cuneate at the base : flowers solitary or 2 together, 1. J. Curtissii. 



Leaf-blades abruptly narrowed or truncate at the base : flowers several together. 2. J. pentantha. 



Bracts and calyx conspicuous on account of the dense spreading pubescence. 3. J. tamnifolia. 



1. Jacquemontia Curtissii Peter. Perennial, glabrous, or slightly cobwebby-pubes- 

 cent. Stems prostrate or spreading, branching, 2-9 dm. long : leaves alternate ; blades 

 leathery, oblong to oblong-spatulate, varying to slightly broadest below the middle, 1-2 



cm. broad, the lobes rounded : capsules 8-9 mm. long. 

 In rocky or calcareous soil, southern peninsular Florida. 



2. Jacquemontia pentantha (Jacq. ) G. Don. Annual or biennial, minutely 

 pubescent or glabrate. Stems more or less diffusely branched, the branches 3-10 dm. long : 

 leaf -blades ovate to oblong or ovate-lanceolate, 1.5-5 cm. long, acuminate, undulate, ab- 

 ruptly contracted or truncate at the base ; petioles 5-30 cm. long : peduncles usually longer 

 than the subtending leaves : sepals minutely pubescent at least when young, ovate or 

 broadly ovate, 5-6 mm. long, acute or acuminate : corolla about 2 cm. broad, the angular 

 lobes acute : capsules oval or oval-ovate, about 5 mm. long. [J. violacea (Vahl. ) Choisy. ] 



In sand, Florida Keys and tropical America. 



3. Jacquemontia tamnifolia (L. ) Griseb. Annual, pubescent with tawny hairs. 

 Stems erect or twining, branching, 2-12 dm. long : leaf-blades ovate to oblong-ovate, 5-12 

 cm. long, acuminate, undulate, rounded or cordate at the base ; petioles shorter than the 

 blades : peduncles as long as the subtending leaves or longer : clusters rather dense, con- 

 spicuously bracted: sepals rusty-hirsute, linear-subulate, 7-9 mm. long, attenuate : corolla 

 violet or blue, 1.5-3 cm. wide : capsules spheroidal, 4-5 mm. in diameter. 



In fields and thickets, South Carolina and Arkansas to Florida and tropical America. 



9. CONVOLVULUS L. 



Ann al or perennial, trailing or twining vines, or upright herbs or shrubs. Leaves 

 alternate : blades usually hastate or cordate at the base. Flowers solitary or clustered on 

 axillary peduncles. Calyx naked or subtended by bracts : sepals 5, nearly equal, or the 

 outer larger. Corolla white, pink or purple, funnelform or campanulate : limb plaited, 

 entire, or 5-lobed or 5-angled. Stamens 5, included. Filaments filiform or dilated at the 

 base. Ovary 1-2-celled. Styles united up to the stigmas. Ovules 4. Capsule globose or 

 nearly so, 2-4-valved. Seeds glabrous. Our species are perennials. BINDWEED. 



Calyx enclosed by the 2 large bracts which subtend it. 

 Stems trailing or climbing. 



Mature stem and leaves glabrous or glabrate : leaf-blades ovate or hastate. 



Leaf-blades with more or less angular spreading basal lobes. 1. C, Americanus. 



Leaf-blades with rounded or scarcely angular basal lobes which are not 



spreading. 2. C. sepium. 



Mature stem and leaves copiously and softly pubescent : leaf-blades more or 



less sagittate. 3. C. repen*. 



Stems erect or ascending. 4. C. spithamaeus. 



Calyx without bracts. 



Herbaceous : leaf-blades not leathery. 



Foliage glabrous or nearly so. 5. C. arvenzis. 



Foliage densely pubescent. 

 Sepals auricled 



at the base. 6. C. hermannioides. 



Sepals not auricled. 7. C. incanus. 



Shrubby : leaf-blades leathery. 8. C. Havanensis, 



1. Convolvulus Americanus (Sims) Greene. Stems twining, 1-3 m. long, glabrate, 

 more or less twisted : leaf-blades broadly hastate or ovate-hastate, 5-12 cm. long, acumi- 

 nate or apiculate, undulate, cordate ; petioles as long as the blades or much shorter : peduncles 



