HOUSE, THE GENUS IPOMCEA 
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76. Ipomcea bombycina (Choisy) Benth. & Hook. Gen. PI. 2: 873. 
1876. 
Bombycospermum mexicanum Presl. Reliq. Haenk. 2: 137. pi. 71. 1837. 
Batatas bombycina Choisy, in DC. Prodr. 9: 340, 1845. 
Leaf-blades ovate, acuminate, rounded or obtuse at the base, 8-10 cm. long, 
glabrous above, pubescent beneath; flowering racemes 5-15 cm. long, many-flowered; 
pedicels about 1 cm. long; sepals ovate, 4-6 mm. long, obtuse, silky-pubescent; 
corolla about 4.5 cm. long, the tube 1.5 cm. long by 3 mm. thick, the limb campanu- 
late, 3 cm. long and about 1 cm. thick, silky-pubescent without, purplish; capsules 
1.5-2 cm. high and 7-8 mm. thick. 
Type locality : Western Mexico. 
Distribution: Southwestern Mexico. 
Specimens examined: Guerrero; Teepan, Langlasse 939, 1899 (N). 
Acapulco; Palmer 370, 1894-95 (N, G). 
13. Palmatae. Twining, annual or perennial vines, with palmately or 
digitately divided leaf-blades; seeds hirsute or lanata on the dorsal angles. 
Modesta Raf. FI. Tellur. 4: 75. 1838 (in part). 
Segments of the leaf-blade parted nearly or quite to the 
petiole. 
Margin of the corolla-limb crenulate. 77. 
Margin of the corolla-limb not crenulate. 
Peduncles stout, 1-9-flowered; sepals obtuse. 78. 
Peduncles filiform, 1-2-flowered. Sepals acute, 
equal; corolla violet. 79. 
Sepals unequal, obtuse; corolla white. 80. 
Segments of the leaf-blades parted to or but slightly be¬ 
yond the middle. 
Corolla rose-purple; plant stout, perennial from a 
tuberous root. 81. 
Corolla yellow, with a purple throat; plant slender, 
annual. 82. 
I. Cavanillesii. 
I. cairica. 
I. pulchella. 
I. quinquefolia. 
I. digitata. 
I. flavo-purpurea. 
77. Ipomcea cavanillesii Roem. & Schult. Syst. 4: 214. 1819.— 
Griseb. FI. Br. W. Ind. 470. 1861. 
Ipomcea pentaphylla Cav. Ic. 3: 29. pi. 256. 1794. Not 7. pentaphylla Jacq. 1788. 
Convolvulus cavanillesii Spreng. Syst. 4: 590. 1825. 
Batatas cavanillesii G. Don, Gen. Syst. 4: 262. 1838. 
Ipomcea bouvetii Duchass. & Walp. in Linnaea 23: 752. 1850. 
Closely resembling I. cairica ; sepals ovate or ovate-lanceolate, 6-7 mm. long, 
coriaceous, glabrous or the outer ones punctate-scabrous; corolla pale rose-colored, 
white below, about 5 cm. long, the ovate, rounded lobes of the limb crenulate; seeds 
lanate. 
