Descriptive Flora 



163 



Acer ales viridiflora (Ral) Eaton. Milkweed. 



A tall, simple-stemmed species with flowers similar to the 

 preceding but with broad, leathery, usually opposite, short- 

 petioled leaves, iy 2 to 214" long and with blunt or notched tips. 

 July and August. Not common. 



Asclepias lindlieimeri Engelm. 



(Podostemma lindheimeri [Engelm.] Greene.) 



Plants with milky sap and one to several stout reclining 

 stems coming from the same root. Leaves simple, alternating 

 in pairs along the thick stems. Blades 2 to Sy 2 " long, oblong or 

 oval or oblong oval, thick, toothless, blunt-tipped. Flowers few 

 to several in the axils of the upper leaves, similar to the above 

 milkweeds in general structure, the individual flowers having 

 long, erect hoods, slightly less than three-eighths long, and 

 reflexed greenish corolla lobes equally as long as the hoods. 

 Calyx lobes very small, about long. Hoods twice the height 

 of the anthers. Pods similar to the above milkweeds. Not 

 common. 



Asclepiodora decumbens (Nutt.) A. Gray. Antelope Horns. 



Plants with many branches spreading radially from a com- 

 mon woody root, each branch ending in a rounded, greenish- 

 yellow flower cluster, 2y 2 to 3" across. Flowers queer, saucer- 

 shaped, about y 2 across, with greenish lobes and purplish hoods. 

 Sepals 5, small. Petals 5, larger than the sepals, broader, green- 

 ish and spreading. Leaves simple, alternate, 2 to 6" long, lanceo- 

 late, 1 main vein at base, and tapering into a long, narrow tip. 

 Pods similar to any of the milkweeds, splitting on one side and 

 containing many flat brown seeds each with a tuft of silky hairs 

 at one end. April and May. On dry, rocky hillsides of the 

 Edward's Plateau. 



Asclepiodora viridis (Walt.) A. Gray. Antelope Horns. 



Green Milkweed. 



Similar to the preceding species but flowers are in 2 or 3 

 clusters at the ends of the many branches. Rare. 



