WOOTON AND STANDLEY FLORA OF NEW MEXICO. 665 



New Mexico: Raton; Sierra Grande; Las Vegas; Estancia; Santa Fe; Socorro; 

 Bernal; Suwanee; Pecos; Torrance; ^V]lite Sands; Gray; Pajarito Park. Open slopes 

 and on plains, in the Lower and Upper Sonoran zones. 



6. Sideranthus laevis Woot. & Standi. Contr. U. S. Nat. Herb. 16: 180. 1913. 

 Type locality: Gypsum hills near Lakewood, New Mexico. Type collected by 



Wooton, August 6, 1909. 



Range: Known only from type locality. 



7. Sideranthus glaberrimus Rydb. Bull. Torrey Club 27: 621. 1900. 

 Sideranthus spinulosus glaberrimus A. Nels. in Coulter, New Man. Rocky Mount. 



489. 1909. 

 Tyte locality: Nebraska. 



Range: Nebraska and Kansas to Colorado and northeastern New Mexico. 

 New Mexico: Raton; Nara Visa; highest point of the Llano Estacado. Plains and 

 low hills, in the Upper Sonoran Zone. 



8. Sideranthus gracilis (Nutt.) Rydb. Colo. Agr. Exp. Sta. Bull. 100: 344. 1906. 

 Dieteria gracilis Nutt. Journ. Acad. Phila. II. 1: 177. 1848. 



Aplopajipus gracilis A. Gray, Mem. Amer. Acad. n. ser. 4: 76. 1849. 



Eriocarpum gracile Greene, Erythea 2: 189. 1894. 



Type locality: Near Santa Fe, New Mexico. Type collected by Gambel. 



Range: Colorado and Utah to Arizona, western Texas, and Mexico. 



New Mexico: Stinking Lake; Dulce; Fort Bayard; Mangas Springs; Socorro Moun- 

 tain; Gila Hot Springs; San Luis Mountains; Organ Mountains. Plains and low hills, 

 in the Lower and Upper Sonoran zones. 



9. Sideranthus australis (Greene) Rydb. Bull. Torrey Club 27: 621. 1900. 

 Eriocarpum australe Greene, Erythea 2: 108. 1894. 



Type locality: "Texas, New Mexico, Arizona, and adjacent Mexico." 



Range: Western Texas to Arizona and southward. 



New Mexico: Carrizo Mountains; Santa Fe; Kennedy; Socorro Mountain; Magda- 

 lena; Burro Mountains; Carrizalillo Mountains; Sabinal; Kingston; Mesilla Valley; 

 Organ Mountains; Redlands. Plains and dry hills, in the Lower and Upper Souorau 

 zones. 



20. ISOCOMA Nutt. Rayless goldenrod. 



Stout perennial herbs, 50 cm. high or less, with linear to oblanceolate, entire or 

 toothed leaves; heads very numerous, corymbose, yellow-flowered; involucres tur- 

 binate or narrowly campanulate, the bracts thick, coriaceous, appressed in several 

 series; corollas inflated; achenes short, sericeous. 



KEY to the species. 



Bracts all acute 1. /. oxylepis. 



Bracts obtuse or only the innermost acute. 



Leaves linear; heads slender-pedunculate 2. I. wrightii. 



Leaves linear-oblauceolate, usually narrowly so; heads mostly 



sessile or subsessile 3. I. heterophylla. 



1. Isocoma oxylepis Woot. & Standi. Contr. U. S. Nat. Herb. 16: 180. 1913. 

 Type locality: Near White Water, New Mexico or (JhHiuahua. Type collected by 



E. A. Mearns (no. 2288). 

 Range: Mountains of southwestern New Mexico and adjacent Mexico. 

 New Mexico: Near White Water; Dog Spring. 



2. Isocoma wrightii (A. Gray) Woot. & Standi. Contr. U. S. Nat. Herb. 16: 181. 



1913. 

 Linosyris wrightii A. Gray, PI. Wright. 1: 95. 1852. 

 Bigelov'ia wrightii A. Gray, Proc. Amer. Acad. 8: 639. 1873. 



