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. 



Type locality: "In several parts of Maryland and Pennsylvania, mostly in fields."' 

 Range: Saskatchewan and New England to Florida and Mexico. 

 New Mexico: Sierra Grande (Standhy GOtJO). Plains and dry hills, in the Upper 

 Sonora Zone. 



2. Acerates ivesii (Britton) Woot. & Standi. 



Asclepias lanceolate Ives, Amer. Journ. Sci. 1: 252. 1819, not Walt. 1788. 

 Acerates viridiflora ivesii Britton, Mem. Torrey Club 5: 265. 1894. 

 Type locality: "On the sandy plains easl oi Cedar Hill, in New Haven." 

 Range: 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 Yail, Bull. Torrey Club 25: 37. 1898. 

 Type locality: Oak Creek, Arizona. 



Range: New Mexico and Arizona. 



New Mexico: Near Tesuque; south of Roswell. Upper Sonoran Zone. 



4. Acerates auriculata Engelm. in Torr. U. S. & Mex. Bound. Bot. 160. 1859. 

 Asclepias auriculata Holzinger, Bot. Gaz. 17: 125. 1892. 



Type locality: Dry ravines near I ho Copper Mines and along the Mimbres, New 

 Mexico. Type collected by Bigelow. 



Range: 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. Milkweed. 



Perennial herbs of various habit, with opposite, alternate, or verticillate leaves, 

 tin- 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, nut 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. 

 Leavee Linear or filiform. 



Eoods :'. times as long as the anthers, acute, recurved ; stems 

 much branched, puberulont thioiighont; leaves 



nearly filiform 1. A. macrotis. 



Hoods slightly if at all longer than the anthers, toothed or 

 obtuse, 'ic, i; stems simple or sparingly branched, 

 glabrous or nearly so; leaves broader. 



Eoods 5 toothed 2. A. quinquedi ntata. 



Hoods entire. 



Leaves scattered, rigid; plants L0 to 20 cm. high. . . 3. I pumila. 

 Leaves opposite or verticillate, weak; plants 10 to 



60 cm. high or more 1. .1. galioides. 



Leaves lanceolate or broader. 



I eaves narrowly lanceolate to narrowly oblong, acute. 



Stems hirsute; corolla orange 5. A. tubi 



Steins not, hirsute; corolla never OM 



Pedicels erect in fruit; Mowers bright, purple; 

 plants tall, erect, 60 to LOO cm. high, nearly 

 simple (i. A. inearnata. 



