VOL. IV. J Colorado Plants. 1 1 



name it was first described. The following characteristics not 

 given in Nuttall's description, seem worthy of note: The bracts 

 within the involucre which in Eriogona generally are so small 

 as to be seldom noticed, in this species are larger than the teeth 

 of the involucre, which therefore seems to be double; the 

 capillary branchlets are geniculate about the middle, usually 

 bending towards their axis. It is rare at Grand Junction, but 

 was common on a hill-side in Montezuma Cailon in Southeastern 

 Utah. 



Eriogonum salsuginosum Hook. There are two forms of 

 this that are strikingly unlike, but specimens with peculiarities 

 of both are to be found on the same plant. One has the 

 involucre sessile in the axils of the leaves or the forks of the 

 stem and appears close and compact; the other has the heads at 

 the ends of hair-like peduncles of from one to three inches long; 

 the sessile heads are often found as well as the long pedunculate 

 ones on these specimens which usually have narrower leaves 

 than the first form. The pedicels are generally purple and often 

 the whole plant has the same color. Found at Grand Junction 

 and along McElmo Creek, in Colorado. It also grew on rocky, 

 rounded hills in company with E. glandulosiun and E. divari- 

 catu7n, in Montezuma Canon, in Southeastern Utah. 



Eriogonum microthecum Nutt. The varieties of this 

 species are puzzling, for it seems hard to know where and how 

 to draw the line between it and E. cory^nbosiim Benth. The 

 flowers of the two species and their varieties differ so little as to 

 furnish obscure distinguishing marks. The chief marks of 

 difference are in the manner of growth and flowering. It seems 

 best to arrange them in this way until more material can be 

 obtained. 



The type and the variety effusiim have been sufficiently 

 described; but there is a variety on the mesas at Durango, which 

 seems to be undescribed. I propose to name it var. rigidum 

 because of its stiff manner of branching and flowering. Stems 

 woody, one to two feet tall, branching from the base and also 

 above, with erect branches tomentose throughout; leaves narrow, 

 linear, revolute, numerous along the stem, about 2 cm. long; 



