WOOTON AND STANDLEY FLORA OF NEW MEXICO. 131 



Lower bracts not appearing as a continuation of the stems, or 

 if so channeled on the upper surface; inflorescence ter- 

 minal. 

 Leaves septate, sometimes equitant, the septa sometimes 

 poorly developed and hard to see in dried material. 

 Leaves terete, not equitant. 



Capsules narrowly lanceolate; inflorescence with 

 short branches; flowers echinate-sp reading, or 

 the lowest of the head re flexed. 

 Heads 7 to 8 mm. in diameter; leaf blades erect; 



petals usually longer than the sepals 4. /. nodosus. 



Heads more than 10 mm. in diameter; leaf blades 

 usually spreading; petals shorter than the 



sepals 5. /. torreyi. 



Capsules oblong; inflorescence with elongated 

 branches (in J", mertensianus a single head); 

 flowers erect or ascending. 

 Heads several; leaves terete; seeds not caudate.. 6. /. badius. 

 Heads solitary or rarely 2 or 3; leaves somewhat 



flattened; seeds mostly caudate 7. J. mertensianus. 



Leaves equitant, laterally flattened, with one edge 

 toward the stem. 

 Flower clusters numerous, small, 5 to 12-flowered, 



generally light-colored 8. J. brunnesenw. 



Flower clusters few, larger, 15 to 25-flowered, 

 usually dark-colored. 

 Perianth segments green-margined; ligules 



usually not auricled 9. /. parous. 



Perianth segments fuscous or dark brown; 



ligules produced into small auricles 10. J. saximontanus. 



Leaves neither septate nor equitant. 



Leaves hollow; flowers few, in small head.. 



Stems leafy only at base; perianth about 4 mm. 

 long; lower bracts of inflorescence mem- 

 branous II. ./. triglumis. 



Stems leafy throughout; perianth segments 5 to 6 



mni. long; lower bracts foliaceous L2. ./. castaneus. 



Leaves not hollow; flowers numerous. 



Flowers no< bracteolate, in true heads en bran< I 



el" the infiori -< on. . ; leav< broad and grass- 

 like L3. J. kmgistylis. 



Flowers bracteolate, inserted singly on the branches 



tif the inflorescence; leaves narrowly linear, 



flat, or subterete and channeled. 



Annual; stems branched 14. J. bu/onius. 



Perennials; stems simple. 



Auricles cartilaginous, yellowish brown; 

 bracts usually elongated, much <\ 



ding the inflorescence 15. J.dudl 



Auricles Bcarious or membranaceous; bracts 



usually much shorter, hardly • 



ceeding the inflorescence. 



