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 & Pay son 

 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 arid 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 142Q 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 

 II. campestris, but the tip of the keel is always purple and the 

 leaflets more numerous and glabrate above. 



