180 



were dimorphic, depressed-globose or oblong. Where there 

 are three fruits in a corymb, often two will be globose, with 

 long peduncles, the third oblong. Some of the prickles are over 

 8 mm. long, and all are straight. I think this is a distinct 

 species, Rosa angustiarum. 



Rosa pratincola setulosa Ckll. will become R. siiffulta f. setulosa, 



Hoffmanseggia jamesii T. & G. was found by Mr. Andrews 

 between Lafayette and Erie. 



Aragallus. Our species are to be transferred to Oxytropis, and 

 two new combinations appear to be necessary : Oxytropis minor 

 {Aragallus minor (Gray) Ckll.), and Oxytropis dispar {Ara- 

 gallus dispar Nels., A. patens Rydb.). 



Viola Raflnesquii Greene is locally abundant at Boulder, but 

 apparently has been introduced. 



Pediocactus Simpsoni (Engelm.) Britt. & Rose is reported by 

 Andrews from the high foothills north and south of Boulder, 

 and the variety minor {Echinocactus simpsoni minor Engelm.) 

 of the same from below Eldora. 



Chamaenerion spicatum (Lam.) S. F. Gray f. alba, with white 

 flowers, was found by me at Ward, 1917. The same variation 

 {alba Hort..) is known in cultivation (cf. Standard Cyclop 

 Horticulture) . 



Oenothera strigosa of the Boulder list is 0. cockerelli de Vries. 



Mertensia secundorum Ckll. does not seem to be the true myosoti- 

 folia Heller, from Red Cliff, nor can it well be M. lateriflora 

 Greene, as Rydberg has it. I think it should be called M. 

 lanceolata var. secundorum. The condition of affairs in the 

 M. lanceolata group suggests the hybridization of two or more 

 species, the ranges of which have come to overlap; but only 

 experimental work can bring out the facts. Variability, with 

 strongly heterozygous types, does not necessarily indicate 

 hybridization ; thus it exists in our district in Ratibida columni- 

 fera, which cannot well be suspected of any sort of bastardy. 



Solanum elaeagnifolium Cav. was found by Andrews near Mar- 

 shall ; of course a stray. 



Castilleja sessiliflora Pursh was collected at Boulder by Mr. E. 

 Bethel, May, 191 6. It has also been obtained since, and is 



