WOOTON AND STANDLEY FLORA OF NEW MEXICO. 



131 



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

 if 60 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-spreading, 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; iuflorescence with elongated 

 branches (ia /. mertensianus a single head); 

 flowers erect ox ascending. 

 Heads several; leaves terete; seeds not caudate.. 6. J.hadius. 

 Heads solitary or rarely 2 or 3; leaves somewhat 



flattened; seeds mostly caudate 7. J. viertensixinus. 



Leaves equitant, laterally flattened, with one edge 

 toward the stem. 

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



generally light-colored 8. /. brunnescens. 



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

 usually dark-colored. 

 Pei'ianth segments green-margined; ligules 



usually not auricled 9. J. parous. 



Perianth segments fuscous or dark brown; 



ligules produced into small auricles 10. /. saximontanus. 



Leaves neither septate nor equitant. 



Leaves hollow; flowers few, in small heads. 



Stems leafy only at base; perianth about 4 mm. 

 long; lower bracts of inflorescence mem- 

 branous 11 . /. triglumis. 



Stems leafy throughout; perianth segments 5 to 6 



mm. long; lower bracts foliaceous 12. /. castaneus. 



Leaves not hollow; flowers numerous. 



Flowers not bracteolate, in true heads on branches 

 of the inflorescence; leaves broad and grass- 

 like 13. /. longistylis. 



Flowers bracteolate, inserted singly on the branches 

 of the inflorescence; leaves narrowly linear, 

 flat, or siibterete and channeled. 



Annual; stems branched 14. /. hufonws. 



Perennials; stems simple. 



Auricles cartilaginous, yellowish brown; 

 bracts usually elongated, much ex- 

 ceeding the inflorescence 15, J. dudleyi. 



Auricles scarious or membranaceous; bracts 

 iisually much shorter, hardly ex- 

 ceeding the inflorescence. 



