446 RYDBERG: PHYTOGEOGRAPHICAL NOTES 
4. HoG-Backs* 
Common to the Southern and Northern Rockies 
ie H. epburnit 
Engelmann 
occidentalis 
“ phaenacephala 
obtusata 
rupestris 
“  Helleri 
Rossii 
Eriogonum arcuatum 
flavum 
umbellatum 
Oreobroma pygmaea 
Silene acaulis 
Cerastium Behringianum 
Alsinopsis Nuttallii 
: obtusiloba _ 
Anemone parviflora 
= tetonensis (Utah) 
i Drummondii 
Pulsatilla ludoviciana 
Smelowskia americana 
y lineariloba 
airs ventrosa 
oligosperma 
andina 
crassa 
“ - Juteola 
aurea 
“e 
Rhodiola integrifolia 
Ivesia Gordonit 
Potentilla divisa 
‘nivea 
uniflora 
' saximontana 
arachnoidea 
Sibbaldia procumbens 
Dastphora fruticosa var. 
Trifoium nanum 
Androsace, carinata 
Gilia globylaris 
Phe depressa 
caespitosa 
Leen elongatum 
argenteum 
Castilleja occidentalis 
Erigeron compositus 
‘““ melanocephalus 
“simplex 
Kescpictrbae aprica 
media 
- sedoides 
re umbrinella 
Chaenactis alpina 
Senecio Purshianus 
Artemisia scopulorum 
a spithamaea 
Restricted to the Southern Rockies 
Eriogonum chloranthum 
neglectum 
Paronychia pulvinata 
Arenaria Fendleri 
Thlaspi coloradense 
“purpurascens 
* For discussion see Bull. Torrey Club 42: 633. 1915. 
