HOUSE, THE GENUS IPO MCE A 
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86. Ipomcea 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-flowered; pedicels 5-10 mm. long and with 
the calyx strongly furrowed or wrinkled 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 Cuernavaca, on lava beds, Pringle 
7229, 1896 (G). 
87. Ipomcea macrorhiza Michx. FI. Bor. Am. 1: 141. 1803.—G. Don, 
Gen.Syst. 4: 277. 1838. 
Ipomcea jalapa Pursh, FI. Am. Sept. 1: 146. 1814. (as to descr. excl. syn. L.). 
Convolvulus macrorhizus Ell. Bot. S. C. & Ga. 1: 252. 1817. 
Ipomcea mechoacan Nutt, in Am. Jour. Sci. 5: 289. 1822. 
Ipomcea michauxii Sweet, Hort. Brit. 288. 1826.— Chapm. FI. Southern U. S. 343. 
1860. 
Ipomcea 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; corolla 6-8 cm. long. 
Type locality; Mazatlan, Lower California. 
Distribution : Rocky or dry thickets, Cape region, Lower California, 
and northwestern Mexico. 
