WOOTON AND STANDLEY FLORA OF NEW MEXICO. 185 



Involucres in the forks of the in- 

 florescence sessile. (Leaves 



revolute) 32. E. nudicaule. 



Involucres in the forks of the 

 branches distinctly peduncled, 

 at least the lower ones. 



Leaves linear, revolute 33. E. trlstichum. 



Leaves Unear-oblong, flat 34. E. lonchophyl- 



lum. 

 Flowering branches leafy up to the in- 

 florescence, the peduncles relatively 

 short. 

 Leaf blades broad, 1 cm. wide or more, 

 oblong to oval, obtuse. 



Involucres 4 to 5 mm. long 35. E. fendlerianum. 



Involucres 2 to 2.5 mm. long. 

 Branches of the inflorescence 



strongly divaricate 36. E. divergens. 



Branches of the inflorescence as- 

 cending 37. E. corymbosum. 



Leaf blades narrow, 5 mm. wide or less, 

 linear or spatulate, acute. 

 Leaf blades oblanceolate, flat; in- 

 florescence densely branched, 

 20 cm. high or less, tomentu- 



lose 38. E. effusum. 



Leaf blades linear, revolute ; inflores- 

 cence sparingly branched, 5 cm. 

 high or less, glabrous or tomen- 

 tulose. 

 Inflorescence glabrous; leaves 16 



to 35 mm. long 39. E. leptophyUum. 



Inflorescence tomentulose; leaves 



15 mm. long or less 40. E. simpsonii. 



1. Eriogonum alatum Torr. in Sitgreaves, Rep. Zuni & Colo. 168. pi. 8. 1854. 

 Type locality: On the Zuni River, New Mexico. 



Range: Nebraska and Wyoming to Texas and Arizona. 



New Mexico: Common from the Black Range to the White Mountains and north- 

 ward to the Colorado line. Dry slopes, in the Upper Sonoran and Transition zones. 



2. Eriogonum triste S. Wats. Proc. Amer. Acad. 10: 347. 1875. 

 Type locality: Kane County, southern Utah. 



Range : Utah and Colorado to Arizona and New Mexico. 



New Mexico: Farmington (Standky 7123); Upper Canadian (Bigelow). Dry hills, 

 in the Upper Sonoran Zone. 



3. Eriogonura hieracifoUura Benth. in DC. Prodr. 14: 6. 1853. 

 Type locality: Western Texa.s. 



Range: Southern New Mexico and western Texas. 



New Mexico: Mountains southeast of Patterson; Horse Spring; Gila Hot Springs; 

 White Mountains; Fort Stanton; Queen. Dry hills, in the Upper Sonoran Zone. 



4. Eriogonum pannosmn Woot. & Standi. Contr. U. S. Nat. Herb. 16: 118. 1913. 

 Type LOCALrrY: Organ Mountains, New Mexico. Type collected by G. R. Vasey, 



August, 1881. 



