RYDBERG: PuHy APHICAL NOTES 463 
Douglasia montana and Eritrichium elongatum. Acomastylis 
(Sieversia) turbinata is found in a depauperate form on the crests 
and in better development in the meadows. The beautiful paint- 
; brushes, Castilleja occidentalis and C. Haydeni (southern Rockies), 
are found mostly on the slopes, connecting the crests with the 
j meadows. 
Of the grasses, Poa rupicola, P. Pattersonii, P. Lettermanni, 
Festuca brachyphylla, F. saximontana, F. supina, and Agropyron 
Scribneri are mostly limited to the crest themselves, while Trise- 
lum subspicatum, Deschampsia curtifolia, Agropyron andinum, 
and A. latiglume frequent the slopes or even run down into the 
meadows. 
The following plants are the most common and most generally 
distributed alpine xerophytes belonging to this formation: 
: ier 
Calamagrostis purpurascens *Heuchera parvifolia 
Trisetum subspicatum 
Deschampsia curtifolia 
Poa rupicola 
*Poa crocata 
Festuca brachyphylla 
Festuca saximontana 
Agropyron Scribneri 
Oreobroma pygmaea 
Alsinopsis obtusiloba 
Silene acaulis 
Draba oligosperma 
Draba andina 
Draba densiflora 
*Draba aurea 
Smelowskia americana 
*Sedum stenosepalum 
Potentilla quinquefolia 
Acomastylis turbinata 
*Dasiphora fruticosa 
Dryas octopetala 
*Dasystephana affinis 
Trifolium dasyphyllum 
*Phlox caespitosa 
Castilleja occidentalis 
Antennaria media 
*Antennaria aprica 
*Senecio Purshianus 
Erigeron simplex 
Erigeron compositus 
Erigeron multifidus 
Erigeron trifidus 
The following are common and important plants of this forma- 
tion in the southern Rockies, but lacking or rare in the northern. 
Those with the asterisks are mostly found near or below the timber- 
line, those with the dagger are found in the northern Rockies but 
are rare: 
* Those with asteriks are mostly found near the timber-line and also below. 
