CONIFERS. 39 



Jo urn. 767. In clefts of dry rocks on Mt. Hesperus, at 

 11,000 feet, also in like situations on the upper La Plata, 

 but nowhere common, n. 245. 



CYSTOPTERIS FRAGILIS, Bernh. Schrad. Journ. Bot. i, part 

 2, 27. Rather common on moist cliffs of the upper La 

 Plata and elsewhere, at about 10,000 feet, n. 988. 



EQUISETACE^E. 



EQUISETUM ARVENSE, Linn. Sp. 1061. On Bob Creek at 

 10,000 feet and frequent along alpine or subalpine cold 

 streamlets, n. 989. 



EQUISETUM PYEMALE, Linn. 1. c. Common in wet 

 meadows at Mancos ; also seen at Trimble Springs, n. 103. 



EQUISETUM , No. 1129, a few plants only, in a 



wet meadow at Mancos, not well in fruit. 



CONIFERS. 



PINUS EDULIS, Engelm. Wislizenu's Rep. 88. Mancos, 

 at about 7,200 feet, constituting along with Junipenis mono- 

 sperma, the low sparse woodland growth of the first foot- 

 hills, n. 93. 



PINUS PONDEROSA scopULORUM, Engelm. in Bot. Calif, ii. 

 126. This common pine of the Rocky Mountains is said 

 by the collectors to begin on the hills north of Mancos, at 

 an elevation of about 8,000 feet, and to mark its own dis- 

 tinct floral belt or zone lying between that of the pinon and 

 cedar belt below, and of the aspen-spruce zone above, the 

 former beginning at about 7,500 feet, the latter at approxi- 

 mately 9,000 feet. The species is the only timber pine of 

 the region, n. 376. 



