WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 509 
1. Acerates viridiflora (Raf.) Eaton, Man. Bot. ed. 5. 90. 1829. 
Asclepias viridiflora Raf, Med. Repos. N. Y. 5: 360. 1808. 
Tyre Locauity: ‘‘Inseveral partsof Maryland and Pennsylvania, mostly in fields.’’ 
Rance: Saskatchewan and New England to Florida and Mexico. 
New Mexico: Sierra Grande (Standley 6060). Plains and dry hills, in the Upper 
Sonora Zone. 
2. Acerates ivesii (Britton) Woot. & Standl. 
Asclepias lanceolata Ives, Amer. Journ. Sci. 1: 252, 1819, not Walt. 1788. 
Acerates viridiflora ivesii Britton, Mem. Torrey Club 5: 265, 1894, 
Type Locauity: ‘“‘On the sandy plains east of Cedar Hill, in New Haven.”’ 
Rance: Nebraska and South Dakota to Arizona and New Mexico. 
New Mexico: Santa Fe Canyon; Kingman. Plains and low hills, in the Upper 
Sonoran Zone. 
3. Acerates rusbyi Vail, Bull. Torrey Club 25: 37. 1898. 
Type Locauiry: Oak Creek, Arizona. 
Rance: New Mexico and Arizona. 
New Mexico: Near Tesuque; south of Roswell. Upper Sonoran Zone. 
4. Acerates auriculata Engelm. in Torr. U. 8. & Mex. Bound. Bot. 160. 1859. 
Asclepias auriculata Holzinger, Bot. Gaz. 17: 125, 1892. 
TypE Locatity: Dry ravines near the Copper Mines and along the Mimbres, New 
Mexico. Type collected by Bigelow. 
Rance: Nebraska and Kansas to New Mexico and Texas. 
New Mexico: Lower Plaza; Organ Mountains; White Mountains. Dry hills, in 
the Upper Sonoran and Transition zones. 
5. ASCLEPIAS L. MmKweEep. 
Perennial herbs of various habit, with opposite, alternate, or verticillate leaves, 
the flowers in pedunculate umbels, borne mostly near the top of the stem, pseudo- 
terminal; calyx small, green, often with minute glands at the base of the lobes; 
corolla rotate, deeply 5-parted, the lobes reflexed in anthesis; hoods of the crown of 
various shapes, not narrowed below, bearing hornlike processes within the hood; 
anther wings broader below the middle; stigma 5-angled, flat-topped; follicles mostly 
smooth; seeds comose. 
KEY TO THE SPECIES. 
Leaves linear or filiform. 
Hoods 3 times as long as the anthers, acute, recurved; stems 
much branched, puberulent throughout; leaves 
nearly filiform........------------+---++-++----- 1. A. macrotis. 
Hoods slightly if at all longer than the anthers, toothed or 
obtuse, erect; stems simple or sparingly branched, 
glabrous or nearly so; leaves broader. 
Hoods 5-toothed...............-2-2----- 2-2 e eee eee 2. A. quinquedentata. 
Hoods entire. 
Leaves scattered, rigid; plants LO to 20 cm. high... 3. A. pumila. 
Leaves opposite or verticillate, weak; plants 40 to 
60 cm. high or more... ...--.---------+-- 4. A. galioides. 
Leaves lanceolate or broader. 
Leaves narrowly lanceolate to narrowly oblong, acute. 
Stems hirsute; corolla orange.......-....--.-------- 5. A. tuberosa. 
Stems not hirsute; corolla never orange. 
Pedicels erect in fruit; flowers bright purple; 
plants tall, erect, 60 to 100 cm. high, nearly 
simple.....-.-...- 222-20. eee eee eee eee ee 6. A. incarnata. 
