1174 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Corolla lobes villous or barbate within. 



Gynostegium distinctly stalked, the column about as long as the anthers. 



Leaves lance-linear 6. M. multifiorum. 



Leaves lance-oblong to oval. 



Umbels sessile or nearly so 7. M. schlecMendalilii. 



Umbels pedunculate 8. M. pedunculare. 



Gynostegium sessile or sliort-stipitate. 

 Corolla lobes linear. 



Calyx lobes acuminate 9. M. watsonianum. 



Calyx lobes obtuse 10. M. barbigerum. 



Corolla lobes oblong or ovate. 



Corona scales lanceolate 11. M. lanceolatuiii» 



Corona scales linear or subulate. 



Flowers 1.5 mm. long or less 12. M. latifolium. 



Flowers 2 to 4 mm. long. 



Corona scales much exceeding the gynostegium 13. M. pringlei. 



Corona scales about equaling the gynostegium 14. M. chiapense. 



1. Metastelma subcordatum Benth. Bot. Voy. Sulph. 33. pi. 18. 1844. 

 Type from Magdalena Bay, Baja California. 



Slender vine, fruticose below, glabrous; leaves ovate-oblong, acumiuate- 

 mucronate; umbels subsesslle, the pedicels glabrous; corolla lobes ovate; co- 

 rona scales lanceolate, acutisli, slightly longer than the sessile gynostegium. 



2. Metastelma schaffneri A. Gray, Proc. Amer. Acad. 21 : 396. 1886. 

 Type collected near San Luis Potosl. 



Stems glabrous ; leaves lanceolate, obtuse at base ; corolla lobes oblong-ovate ; 

 corona scales linear-subulate, exceeding the gynostegium. 



3. Metastelma cuneatum T. S. Brandeg. Zoe 5 : 216. 1905. 

 Type collected at Yerba Buena, near Altata, Sinaloa. 



Stems very slender, bifariously puberulent ; leaves lanceolate, 1.5 to 3 cm. 

 long, acuminate, obtuse or rounded at base ; nearly glabrous ; umbels 4 to 9- 

 flowered, subsessile ; corolla 2 mm. long, the lobes acute ; corona scales minute. 



4. Metastelma macropodum Greenm. Proc. Amer. Acad. 33: 481. 1898. 

 Puebla and Oaxaca ; type from Tomellln Canyon, Oaxaca, altitude 1,540 



meters. 



Stems slender, bifariously puberulent ; leaves oblong-linear or linear-lanceo- 

 late, 1.5 to 2.5 cm. long, acute, obtuse at base, glabrous or nearly so ; peduncles 

 3 to 18 mm. long ; corolla 3 to 4 mm. long, yellowish white ; corona scales- 

 about equaling the gynostegium. 



5. Metastelma palmeri S. Wats. Proc. Amer. Acad. 18: 115. 1883. 

 Coahuila and San Luis Potosi. Western Texas; type from Laredo. 

 Stems sufErutescent, slender ; leaves linear-lanceolate or oblong-linear, 1 to- 



3 cm. long, acute, obtuse or acute at base, nearly glabrous; corolla about 2 

 mm. long; corona scales lanceolate, acuminate, slightly exceeding the gyno- 

 stegium ; follicles about 4.5 cm. long. 



6. Metastelma multiflorum S. Wats. Proc. Amer. Acad. 25: 158. 1890. 

 Jalisco to Morelos and Oaxaca ; type collected near Guadalajara. 



Stems glabrous or nearly so, suffrutescent below ; leaves 1 to 3.5 cm. long, 

 attenuate, obtuse at base, the upper ones much reduced ; umbels sessile ; flowers 

 about 2 mm. long ; calyx lobes acute or acuminate ; corona lobes linear-lanceo- 

 late, exceeding the stigma. 



