VOL. IV. | Colorado Plants. II 
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 Cafion in Southeastern 
Utah. 
ER1oconum sAtsucinosum 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 aré generaily 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 2. glandulosum and £. divari- 
catum, in Montezuma Cajfion, in Southeastern Utah. 
Er1oconum microtaEcum Nutt. The varieties of this 
species are puzzling, for it seems hard to know where and how 
to draw the line between it and £&. corymbosum 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 effusum 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; 
