4 o 



DICHONDRACEAE. 



VOL. III. 



i. Dichondra carolinensis Michx. 

 Fig. 2423. 



Dichondra. 



Dichondra carolinensis Michx. Fl. Bor. Am. i: 136. 1803. 



Somewhat pubescent, or glabrous ; stems almost fili- 

 form, creeping, rooting at the nodes, 6'-2 long. Leaves 

 orbicular to reniform, deeply cordate, *'-ii' in diameter, 

 palmately veined ; petiole often much longer than the 

 blade; flowers i"-2" broad; peduncles filiform; sepals 

 obtuse, spatulate or obovate; corolla yellow to white, 

 shorter than the sepals, its lobes ovate to oblong; cap- 

 sule i" high or less. 



In moist or wet places, Virginia to Texas and Mexico, 

 near the coast. Widely distributed in Central and South 

 America. Has been regarded as referable to the Old 

 World D. repens Forst. ; the specific name evolvulacea was 

 used for it in our first edition, in error. 



Family 20. CONVOLVULACEAE Vent. Tabl. 2 : 394. 1799. 

 MORNING-GLORY FAMILY. 



Herbs, some tropical species shrubs or trees, the stems twining, ascending, 

 trailing or erect, with alternate exstipulate entire dentate lobed or dissected leaves, 

 and regular perfect axillary cymose or solitary flowers. Calyx inferior, 5-parted 

 or 5-divided, usually persistent, the segments or sepals imbricated. Coralla gamo- 

 petalous, funnel form, salver form, campanulate, tubular or rarely subrotate, the 

 limb 5~angled, 5-lobed or entire. Stamens 5, inserted low down on the tube of 

 the corolla and alternate with its lobes, all anther-bearing, the filaments filiform, 

 or dilated at the base, equal or unequal ; anthers 2-celled, the sacs longitudinally 

 dehiscent. Disk annular or none. Ovary superior, sessile, 2-3-celled, with 2 

 ovules in each cavity, or falsely 4-6-celled with a single ovule in each cavity, 

 entire or 2-4-divided ; styles 1-3, terminal, or arising from between the ovary- 

 divisions ; ovules anatropous. Fruit a 2-4-valved capsule or of 2-4 distinct car- 

 pels, in our species. Seeds erect, the testa villous, pubescent or glabrous ; embryo 

 plaited or crumpled; cotyledons foliaceous; endosperm fleshy or cartilaginous, 

 usually scanty. 



About 45 genera and probably 1000 species, of wide geographic distribution, most abundant 

 in the tropics. 



Style 2-cleft or 2-divided. 

 Style 2-cleft or 2-parted. 



Style 2-divided to the ovary, each division 2-cleft. 

 Style entire up to the stigma. 



Stigma or stigmas capitate or globose. 



Corolla salverform ; stamens and style exserted. 

 Corolla funnelform or campanulate ; stamens and style included. 

 Stigmas 2, filiform to oblong. 



1. Stylisma. 



2. Evolvulus. 



3. Quamoclit. 



4. Ipomoea. 



5. Convolvulus. 



i. STYLISMA Raf. Neog. 2. 1825. 



Herbs, mostly perennial and procumbent, with entire short-petioled or sessile leaves, and 

 i-5-flowered axillary peduncles; flowers white, purple, pink, or yellow. Sepals acute or 

 obtuse. Corolla campanulate or funnelform-campanulate; limb plaited, S-angled or slightly 

 5-lobed. Stamens included; filaments filiform, or dilated at the base. Ovary 2-celled; style 

 2-cleft or 2-parted; stigmas capitate. Capsule globose to ovoid, 2-celled, 2-4-valved. Style 

 rarely 3-parted and ovary 3-celled. Seeds 1-4, glabrous or pubescent. [Greek, referring to 

 the 2-parted style.] 



Seven known species, of the southeastern United States and Mexico. In our first edition this 

 genus was referred to the Australian Breweria R. Br. Type species : Convolvulus aquations Walt. 



Sepals acute or acuminate ; leaves oblong, elliptic or linear. 



Corolla white ; filaments pubescent ; plant pubescent or puberulent. 



Corolla purple ; filaments glabrous ; plants silky-tomentose. 

 Sepals obtuse ; leaves narrowly linear. 



1. S. humistrata, 



2. 5". aquatica. 



3. 5". Pickeringii. 



