508 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



1. Philibertella crispa (Benth.) Vail, Bull. Torrey Club 24: 306. 1897. 

 Sarcostemma crispum Benth. PI. Hartw. 291. 1841. 



Sarcostemma undulata Torr. U. S. & Mex. Bound. Bot. 161. 1859. 

 Philibertia undulata A. Gray, Proc. Amer. Acad. 12: 95. 1876. 

 Type locality: Aguas Calientes, Mexico. 

 Range: Western Texas to New Mexico and southward. 



New Mexico: Lone Pine; Deming; Organ Mountains; Queen. Rocky hillsides 

 and canyons, in the Lower and Upper Sonoran zones. 



2. Philibertella cynanchoides (Decaisne) Vail, Bull. Torrey Club 24: 307. 1897. 

 Sarcostemma cynanchoides Decaisne in DC. Prodr. 8: 540. 1844. 



Philibertia cynanchoides A. Gray, Proc. Amer. Acad. 12: 64. 1876. 

 Type locality: Mexico. 

 Range: Utah and Arizona to western Texas. 



New Mexico: Mountains west of San Antonio; Kingston; Mesilla Valley; Tularosa; 

 Roswell. Mesas and low hills, in the Lower Sonoran Zone. 



3. Philibertella heterophyUa (Engelm.) Cockerell, Bot. Gaz. 26: 279. 1890. 

 Sarcostemma heterophyUa Engelm. in Torr. U. S. Rep. Expl. Miss. Pacif. 5: 362. 1856. 

 Philibertia linearis heterophyUa A. Gray, Syn. Fl. 2 1 : 88. 1878. 



Type locality: Near Fort Yuma, Arizona. 



Range: Southern California to western Texas and adjacent Mexico. 

 New Mexico: Mesa west of Organ Mountains; Organ Mountains; Knowles. Dry 

 hills and mesas, in the Lower Sonoran Zone. 



3. ASCLEPIODORA A. Gray. Antelope horns. 1 



Erect or spreading perennial herb, sparingly pubescent , wit h several stout ascending 

 stems from a woody root; leaves alternate, elongate-lanceolate, short -pel i< date ; fl< iwers 

 rather large; calyx lobes narrowed, acute; corolla rotate, the lobes broadly ovate, 

 green, spreading in anthesis; hoods inserted over the whorl of the short column, dark 

 purple, obtuse, crested within; anther wings salient above the middle; follicles large, 

 about 8 cm. long, erect, on recurved pedicels. 



1. Asclepiodora decumbens (Nutt.) A. Gray, Proc. Amer. Acad. 12: 66. 1876. 



Ananiherix decumbens Nutt. Trans. Amer. Phil. Soc. n. ser. 5: 201. 1837. 



Acerates decumbens Decaisne in DC. Prodr. 8: 521. 1844. 



Type locality: "On dry hills near the confluence of Kiamesha and Red river." 



Range: Arkansas and Texas to Utah and Arizona. 



New Mexico: Tunitcha Mountains; Carrizo Mountains; Dulce; Sierra Grande; 

 west of Santa Fe; Las Vegas; Magdalena Mountains; Kingston; Organ Mountains; 

 Gray; Cloudcroft; White Mountains. Plains and hills, in the Lower and Upper So- 

 noran zones. 



4. ACERATES Ell. 



Erect perennial herbs 80 cm. high or less, with opposite or alternate leaves, the flow- 

 ers in lateral axillary umbels on short peduncles; horns of the hoods wanting or very 

 obscure; anther wings angled near the middle; otherwise like Asclepias. 



key to the species. 

 Leaves linear. 



Hoods truncate at the apex, with an obscure horn within 3. A. rusbyi. 



I Ii )ods emarginate, crestless within 4. A. auriculata. 



Leaves not linear. 



Leaves oblong; anther wings gradually narrowed below 1. A. viridiflora. 



Leaves elongated-lanceolate; anther wings abruptly narrowed 



below 2. A. ivesii. 



1 A translation of the very appropriate Navaho name, referring to the form of the 

 pods. 



