512 CONTEIBUTIONS FROM THE NATIONAL HERBARIUM. 



12. Asclepias elata Benth. PL Hartw. 290. 1848. 

 Type locality: Agua.s Calientes, ^lexico. 

 Range: New Mexico and Arizona and southward. 

 New Mexico: Black Range; Van Pattens; Queen. 



This may be the same as A. glaucescens H. B. K., as stated by Doctor Gray, but 

 the two seem different. 



13. Asclepias arenaria Torr. U. S. & Mex. Bound. Bot. 162. 1859. 



Type locality: Sandy banks, Jornada del Muerto, and on the upper Rio Gila, 

 New Mexico. 



Range: New Mexico and Arizona. 



New Mexico: Between El Paso and Monument 53; White Sands; Roswell. Mesas 

 and low hills, in the Lower Sonoran Zone. 



14. Asclepias latifolia (Torr.) Raf. Atl. Journ. 146. 1833. 

 Asclepias obtusifolia latifolia Torr. Ann. Lye. N. Y. 2: 217. 1828. 

 Asclepias jamesii Torr. U. S. & Mex. Bound. Bot. 162. 1859. 

 Type locality: "On the Canadian?" New Mexico or Colorado. 

 Range : Colorado to Arizona and Texas. 



New Mexico: Cross L Ranch; Sierra Grande; Nara Visa; lower Gila above Dun- 

 can; Hillsboro; Burro Mountains; Emory Peak; Ruidoso Creek; Redlands. Plains 

 and low hills, in the Lower and Upper Sonoran zones. 



Asclepias scaposa Vail, Bull. Torrey Club 25: 171. 1897. 



Type locality: Near Santa Rita, New Mexico. Type collected by Wright in 

 1851. 



This we have not seen. It was described without flowers, hence it is impossible 

 to tell whether it is an Asclepias or a Podostemma. Its general appearance, as de- 

 scribed, suggests the latter genus. 



6. PODOSTEMMA Greene. 



Coarse perennial herbs, resembling Asclepias; flowers rather large, in short-pedun- 

 culate umbels, the blooming ones well down the stem, thus appearing lateral; hoods 

 large, erect, much longer than the anthers and surpassing the crown by half their 

 length, narrow below (pseudostipitate), expanded above and mostly bicorniculate; 

 anther ^v^ngs broadest in the middle, notched. 



key to the species. 



Hoods 3.5 mm. long or less; leaves lanceolate 1. P. emoryi. 



Hoods 7 mm. long; leaves oblong 2. P. lindheimeri. 



1. Podosteinma emoryi Greene, Pittonia 3: 237. 1897. 

 Type locality: Texas or New Mexico. 



Range: Western Texas to southern New Mexico. 

 New Mexico: Mangas Springs. "Lower Sonoran Zone. 



It is impossible to tell where the type was collected, for part of the type number 

 came from Texas and part from New Mexico. 



2. Podosteinma lindheimeri (Engelm. & Gray) Greene, Pittonia 3: 236. 1897. 

 Asclepias lindheimeri Engelm. & Gray, Bost. Journ. Nat. Hist. 5: 250. 1845. 

 Asclepias wrightii Greene; A. Gray, Proc. Amer. Acad. 16: 102. 1880. 



Type locality: Near Industry, Texas. 

 Range: Western Texas and southern New Mexico. 



New Mexico: Santa Rita; Trujillo Creek; mesa west of Organ Mountains; Organ 

 Mountains; south of Roswell. Mesas, in the Lower and Upper Sonoran zones. 



