Fields, wet depressions, ditch banks and roadsides, in Tex. common in lower 

 Rio Grande Valley, locally n. to Bexar Co., Apr.-July; nat. of Parag., introd. in 

 s. Tex., adj. Mex. and n. S.A. 



11. Ipomoea trichocarpa Ell. 



Perennial but flowering first year, from branched root, twining and low-climbing; 

 leaf blades very variable, cordate-ovate in outline, entire to deeply 3- or 5-lobed, 

 2-8 cm. long. 1.5-7 cm. wide: peduncles 1- to several-flowered; sepals noticeably 

 unequal, oblong-elliptic, acuminate; corolla rosy-lavender to purple-rose with dark 

 center (rarely white), 2.8-5.5 cm. long. /. commiitata R. & S., /. Carolina (L.) 

 Pursh. not L.; has been incorrectly referred to the related tropical species /. triloba 

 L. and /. trifida H.B.K. 



Thickets, fields, wet depressions and flats, roadsides and disturbed ground, 

 June-Oct. 



Var. trichocarpa. Sepals hispid-pilose, at least on margins; stem and leaves gla- 

 brous to moderately densely hispid-pilose. Common in e. third of Tex. (but absent 

 from COS. near Red River), local w. to Medina and Menard cos.; s.e. U.S. 



Var. Torreyana (Gray) Shinners. Sepals glabrous; stem and leaves glabrous. Com- 

 mon in cen. Tex., from Dallas, Throckmorton, Sutton and Val Verde cos. to lower 

 Rio Grande Valley, rare in e. Tex. (Cass and Nacogdoches cos., perhaps introd.); 

 also Mex. 



12. Ipomoea lacunosa L. 



Annual from slender taproot, sparsely to rather densely hispid-pubescent, twin- 

 ing and low-climbing; leaf blades variable, cordate-ovate to deltoid-ovate in outline, 

 entire or angled-toothed or 3-lobed, 2-10 cm. long, 1.5-9 cm. wide; peduncles 1- or 

 2-flowered; sepals markedly unequal, oblong-elliptic, acuminate; corolla white 

 (rarely rosy), 1.8-2.3 cm. long. 



Damp thickets, stream banks and ditches, swamps, wet meadows and wet alluvial 

 soils in prairies, common in e. Tex., w. and s. to Tarrant, Travis and Matagorda 

 COS., and Okla. (LeFlore and Cherokee cos.), Sept. -Oct.; s.e. U.S. 



13. Ipomoea sinuata Ort. Alamo vine, correhuela de las doce. 



Trailing to low-climbing perennial; stem and petioles glabrous or spreading- 

 pilose: leaf blades ovate-orbicular in outline, 4-15 cm. long and wide, palmately 

 deeply 5- or 7-lobed, the lobes dentate to pinnatifid, obtuse; peduncles 1- or 

 2-flowered; sepals oblong-elliptic, mucronate; corolla white with purple-red center, 

 3.5-5 cm. long. /. dissecta (Jacq.) Pursh, not L., Merremia dissecta (Jacq.) Hallier 

 f., Operculina dissecta (Jacq.) House. 



Stream banks, wet thickets and in wettish depressions, open ground and disturbed 

 places, s.-cen. Tex. (Travis to Galveston and Val Verde cos. and s.), also cult., 

 May-Nov.; Tex. and Fla. to W.I., Mex. and S.A. 



6. Cuscuta L. Dodder. Love-vine 



Plants leafless and rootless, herbaceous, parasitic; stems yellowish or orange- 

 color, filiform, fleshy-herbaceous, glabrous, twining; flowers small (mostly 2-6 mm. 

 long), sessile or short-pedicellate, in few- to many-flowered cymose clusters, com- 

 monly 5-merous but sometimes 3- or 4-merous; perianth parts mostly united; 

 corolla campanulate to cylindric, shallowly or deeply lobed; stamens inserted in 

 the throat of the corolla, alternating with the usually longer lobes; scalelike toothed, 

 fringed or fimbriate appendages commonly present at base of the corolla tube 

 opposite the stamens; ovary 2-celled; stigmas linear to capitate; fruit a capsule, 

 indehiscent or sometimes opening with a regular or irregular line of circumscission 

 near the base; embryo acotyledonous, filiform or more or less enlarged at one end. 



About 170 species, mostly in the Americas. 



1359 



