506 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. — 
4. Apocynum laurinum Greene, Pittonia 5: 64. 1902, 
Tyre Locauity: Organ Mountains, New Mexico. Type collected by Wooton 
(no. 113). 
RANGE: Mountains of southern New Mexico. 
New Mexico: Organ Mountains; Ruidoso Creek. 
5. Apocynum hypericifolium Ait. Hort. Kew. 1: 304, 1789. 
Type Locauiry: North America. 
Rance: British America to Ohio and New Mexico. ; 
New Mexico: Mesilla Valley. River valleys, in the Lower and Upper Sonoran 
zones. 
6. Apocynum viride Woot. & Standl. Contr. U. 8. Nat. Herb. 16: 159. 1913. 
TYPE LocaLity: Gilmores Ranch on Eagle Creek, White Mountains, Lincoln County, 
New Mexico. Type collected by Wooton and Standley (no. 3451). 
Ranae: New Mexico. 
New Mexico: Farmington; Cedar Hill; Las Vegas; Pecos; Reserve; White and 
Sacramento mountains. Wet ground, in the U pper Sonoran and Transition zones. 
7. Apocynum angustifolium Wooton, Contr. U. 8. Nat. Herb. 16: 159. 1913. 
Type Locauity: Gila River bottom near Cliff, Grant County, New Mexico. Type 
collected by Metcalfe (no. 132). 
Rance: Southwestern New Mexico. 
New Mexico: Cliff; Mimbres; Lower Plaza; Eagle Creek. Along streams, in the 
Upper Sonoran Zone. 
A very distinct species because of its very narrow bright green leaves, nearly all 
of them acute at the base. 
115, ASCLEPIADACEAE, Milkweed Family. 
Herbaceous perennials, erect or twining, mostly with milky juice; leaves simple, 
alternate, opposite, or whorled, exstipulate, mostly entire; flowers perfect, regular, 
mostly umbellate; calyx hypogynous, the tube very short or none, imbricated in 
bud; corolla 5-merous, campanulate, urceolate, rotate, or funnelform, the lobes com- 
monly reflexed; a 5-lobed crown (corona) borne between the corolla and stamens 
and adnate to one or both of them; stamens 5, adnate to the corolla usually near its 
base, monadelphous or distinct; anthers converging around the stigmas, sometimes 
united to each other, the sacs tipped with an inflexed or erect scarious membrane 
or not appendaged at the top, sometimes appendaged at the base; pollen in waxy 
masses (pollinia) connected with the stigma in pairs; pistil of 2 carpels; styles 2, 
with a single peltate discoid stigma; fruit a pair of several to many-seeded follicles; 
seeds comose. 
KEY TO THE GENERA. 
Pollinia horizontal or nearly so; stigma sharply 5-angled, 
depressed; twining vine.....................-.. Ll. Vinceroxicum (p. 507), 
Pollinia pendulous; stigmas various; stems twining or 
straight. 
Crown double, the outer a shallow ring, the inner 
consisting of 5 fleshy hoodlike scales; twining 
Vines... 2.2.2... e ee eee eee ee eee ee eee eee 2. PHILIBERTELLA (p. 507). 
Crown single; erect, ascending, or procumbent herbs. 
Corolla lobes erect-spreading during anthesis; 
hoods of the crown pendulous or saccate 
at the base, curved upward, obtuse, 
crested within, at least in the upper part. 3. AscLEPIODORA (p. 508), 
Corolla lobes reflexed during anthesis; hoods 
various. 
