86 Muhlenbergia, Volume 5 



New Mexico. In the Organ mountains it grows at an altitude 

 of about 6000 feet, on shaded slopes, where it is a tall plant and 

 but little branched. Farther north in the region about Santa 

 Fe it is very low and much branched, growing on the open 

 mesas and foothills, but at about the same altitude. The size of 

 the flowers and bracts varies noticeably in different plants, the 

 forms of northern New Mexico running into the variety glori- 

 osa (Britton) Cockerell. Most of these variations, perhaps, are 

 due to climatic conditions, especially temperature and the water 

 content of the soil. 



In the range of mountains where C. Integra was first found 

 there occurs another Castilleja which somewhat resembles that 

 common species. We have specimens of but three collections 

 in our herbarium, and the plant seems to be much rarer than C. 

 i?itegra. It is here described as 



Castilleja organorum sp. nov. 



An erect perennial: stems clustered, or branched from the 

 base, sparingly branched above, about 4 dm. high, stout, with 

 rather stiff, spreading or often retrorse pubescence throughout, 

 the pubescence above and upon the inflorescence being softer 

 and even slightly matted: leaves numerous, linear, with one or 

 three nerves, 45 mm. long or less, finely scabrate on both sur- 

 faces: flowers rather few in a short and rather dense spike: bracts 

 oblong, entire, broadly obtuse, 2 cm. long or less, scarlet for two- 

 thirds their length, rough pnberulent: calyx 16 mm. long or 

 less, tubular or somewhat distended below, equally cleft before 

 and behind, the lateral divisions each divided into two linear- 

 lanceolate lobes, scarlet above and greenish below, rough puber- 

 ulent: corolla slightly exserted, the galea half as long as the 

 tube or less, bright green faced with scarlet, the rather conspic- 

 uous lower lip consisting of three bright green, strongly incurved 

 teeth: capsule about 12 mm. long, ovoid, with a short beak. 



The type was collected on the rocky sides of the Organ 

 mountains not far from Van Patten's Camp, June 9, 1906, by 

 the writer, altitude about 57<»> feet. Other specimens from the 

 same range areas follows: Filmore canyon, September 23, 10,05, 



