NEW OR NOTEWORTHY NORTH AMERICAN 
CONVOLVULACEAE 
Homer D. House 
(WITH FOUR FIGURES) 
The following notes and descriptions of some American species of 
the Convolvulaceae are based mainly upon material in the herbarium 
of the United States National Museum, and my thanks are due to 
Dr. J. N. Rose and Mr. JosepH H. Parnter of that institution for 
the privilege of examining and studying the specimens. 
Ipomoea petrophila, sp. nov.—§$ ORTHIPOMOEA; Swujfruticosae.— 
Erect or the branches ascending from a perennial root; stems pale 
and finely tomentulose, especially above, 30-60°™ high: leaf-blades 
lanceolate, sometimes broadly so, 4-10™™ long, obtuse at apex, obtuse 
or tapering and 3~nerved at base, greenish and finely sericeous- 
pubescent above, more densely so beneath: sepals unequal, oblong 
or elliptical-oblong, obtuse, the outer ones 6-8™™ long, finely pubes- 
cent, the inner ones glabrous, 8-11™™ long: corolla white with a 
cream-colored throat, 6-8°™ long, glabrous: peduncles 1-5°™ long, 
1-3-flowered; pedicels somewhat thickened but not fleshy, 1-2°™ 
long: capsules conical-ovoid, 14-16™™ high, 2-celled, thick-walled, 
topped by the persistent base of the style which falls away at maturity, 
4-valved, 4-seeded; seeds brownish, 3-angled, about 7™™ long, the 
two dorsal angles with a dense coma of white hairs nearly the length 
of the seed. 
Mexico: State of Chihuahua, rocky hills near Chihuahua, Pringle 340, 
Aug.-Sept. 1885; “type, sheet no. 40372 in U. S. Nat. Herb., Sta. Eulalia Plains, 
Chihuahua, Wilkinson, July and Oct. 1885. 
The type sheet bears the determination “J. longifolia Benth.,” to which the 
species is evidently related. ; 
Ipomoea ciervensis Painter, sp. nov.—$Or1 ; Sufjruti- 
cosae.—Perennial; stems erect, bushy, woody below, 30-60°™ tall, 
densely white tomentulose and pubescent throughout except on the 
corolla: leaves crowded; leaf-blades sessile or the petioles 1-8"™ 
long, elliptical-lanceolate to obovate-lanceolate, 3-5-nerved at the 
Botanical Gazette, vol. 43] [408 
Per: 4 i 
— SS 
