264 RYDBERG: NOTES ON FABACEAE—II 
referred to A. episcopus Wats. According to Macbride A. epis- 
copus has sessile pods; one might suppose from this that the 
latter species was a synonym of H. orthocarpus; but it is not, since 
it really has a short-stipitate and glabrous pod. There is also 
a specimen collected at Salida, Colorado, Johnston & Hedgecock 
634, which resembles Goodding’s very much, but it is in flower 
only and therefore doubtful. So also is Macbride & Payson 
3183 from Idaho, to which reference has already been made. 
25. HOMALOBUS DECUMBENS Nutt. The specimen in the 
Torrey Herbarium consists of two pieces, a small plant with five 
attached branches and a single loose branch; the former bears 
one mature pod and two small racemes in bud; the separate 
branch bears five immature pods. All the pods are minutely 
pubescent and decidedly arcuate, and the mature pod is nearly 
2.5 cm. long and 3 mm. wide; the calyx lobes are subulate and 
less than half as long as the tube. The only specimens in the 
herbarium of the New York Botanical Garden similar to the 
type are Hall & Harbour 142, in part, from Colorado, and 
Goodding 1429 from Wood’s Creek, Wyoming. The pods of 
the latter are very young and scarcely show any indication of 
being arcuate. The specimens in the Gray Herbarium bearing 
the same number have a better developed pod, and I would 
refer them to H. microcarpus. 
A specimen in flower, from Mammoth Hot Springs, Wyoming, 
named by the collectors A. decumbens, viz., Aven & Elias Nelson 
5649, resembles this species in habit but is more canescent. 
Macbride has cited this specimen under A. divergens, but I 
rather think that it belongs either here or under H. tenuifolius 
Nutt. 
26. HOMALOBUS SEROTINUS (A. Gray) Rydb. Gray de- 
scribed Astragalus serotinus as having glabrous or minutely 
pubescent pods, and Macbride says in his key, “pods glabrous 
or nearly so.” There are three sheets of Cooper’s collection in 
the New York herbaria, and in all three the pods are minutely 
strigose. The species varies much in the width of the leaves. 
When they are very narrow the plant resembles much in habit 
H. campestris, but the tip of the keel is always purple and the 
leaflets more numerous and glabrate above. 
