HOUSE, THE GENUS I POM (E A 227 



86. Ipomoea prsecana sp. nov. 



Stout, woody, perennial; stems densely canescent or silvery, furrowed; leaf- 

 blades orbicular, 8-12 cm. long, shallowly cordate, veins 5-7 pairs, densely pubescent 

 or nearly glabrate above, silvery-pubescent beneath; petioles 3-5 cm. long; pedun- 

 cles shorter than the petioles, 3- to 5-fiowered; pedicels 5-10 mm. long and with 

 the calyx strongly furrowed or wrinliled when dried; sepals 18-20 mm. long, imbri- 

 cated, canescent, obtuse, glabrous within; corolla subsalverform, 6-7.5 cm. long, 

 pubescent without, the tube constricted and glabrous at the base; limb 6-10 cm. 

 broad. 



Mexico: Oaxaca; Reyes, 2500-4000 ft. alt. E. W. Nelson 1823, Oct. 

 20, 1894 (type — N, G). Morelos; Near Cuemavaca, on lava beds, Pringle 

 7229, 1896 (G). 



87. Ipomoea macrorhiza Michx.Fl.Bor. Am. 1: 141. 1803. — G. Don, 



Gen.Syst. 4: 277. 1838. 



Ipomcea jalapa Pursh, Fl. Am. Sept. 1: 146. 1814. (as to descr. excl. syn. L.). 



Convolvulus macrorhizus Ell. Bot. S. C. & Ga. 1: 252. 1817. 



Ipomoea mechoacan Nutt. in Am. Jour. Sci. 5: 289. 1822. 



Ipomoea michauxii Sweet, Hort. Brit. 288. 1826.— Chapm. Fl. Southern U. S. 343. 



1860. 

 Ipomoea Purshii G. Don, in Sweet; Hort. Brit. ed. 3, 484. 1839. 



Perennial from a napiform or thickened fusiform root, tomentulose-pubescent; 

 leaf-blades entire or lobed; peduncles 1-5-flowered; sepals unequal, outer ones 

 10-12 mm. long, inner 15-20 mm. long; corolla 7-10 cm. long, magenta at the base; 

 capsules 4-celled. 



Type locality: "In maritimis Georgise et Floridse." (Michx.) 



Distribution: Light sandy soil, near the coast, South Carolina to 

 Florida and northern Mexico. 



Illustrations: Bot. Reg. pi 342. 



Specimens examined: Florida; Curtiss 2165, 4381; Boring, 1899 (Y); 

 Cheshire, 1881 (Y); Chapman (Y); Berg (Y); Levenworth (G). South 

 Carolina; Mellichamp (G). Tamaulipas, Mexico, E. W. Nelson 4441 

 1898 (N). 



88. Ipomcea scopulorum Brandegee, Zoe 5: 169. 1903. 



Pubescent throughout; leaf-blades entire, cordate, 6-7 cm. long; peduncles 

 about as long as the leaves, 1-4-flowered; sepals ovate aristate, coriaceous, unequal, 

 1-2 cm. long; coroUa 6-8 cm. long. 



Type locality; Mazatlan, Lower California. 



Distribution: Rocky or dry thickets. Cape region. Lower California, 

 and northwestern Mexico. 



