602 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



14. Euphorbia tomentulosa S. Wats. Proc. Ainer. Acad. 22: 476. 1887. 

 CJtaniaesycc tomentulosa Millsp. Field Mus. Bot. 2: 412. 1916. 



Baja California and Sonera ; type from Rosario, Baja California. 



Low shrub, 60 cm. high or less, with dichotomous branches; leaves short- 

 petiolate. oval or rounded-oval, 5 to 17 mm. long, finely pubescent ; involucres 

 pubescent, clustered at the ends of the branches, the glands purplish, with 

 white appendages ; capsule glabrous. 



15. Euphorbia fruticulosa Engelm. ; Boiss. in DC. Prodr. 15': 38. 1865. 

 Cliantaesyce fruticosa Millsp. Field Mus. Bot. 2: 409. 1916.. 



Known only from the type locality, Saltillo, Coahuila. 



Glabrous erect shrub, 30 cm. high or less; leaves ovate, glaucescent, 4 to 6 

 mm. long. 



16. Euphorbia magdalenae Benth. Bot. Voy. Sulpli. 50. 1844. 

 Euphorbia blepharostipula Millsp. Contr. U. S. Nat. Herb. 1 : 77. 1890. 

 Chaviacsi/ce magdalenae Millsp. Field Mus. Bot. 2: 410. 1916. 



Baja California ; type from Magdalena Bay. 



Low slender shrub with glabrous or minutely puberulent branches ; leaves 

 nearly sessile, oblong or oval, often emarginate; appendages of the glands white. 



17. Euphorbia anthonyi T. S. Brandeg. Erythea 7: 7. 1899. 

 Euphorbia clarionensis T. S. Brandeg. Erythea 7: 7. 1899. 

 Baja California ; type from San Benito Island. 



Stout shrub, 40 cm. high or less, nearly glabrous ; leaves nearly sessile, broadly 

 oblong or oblong-cbovate, rounded at apex, very unequal at base; glands of the 

 involucre dark brown, the appendages well developed or nearly obsolete. 



18. Euphorbia peganoides Boiss. Cent. Euphorb. 22. 1800. 

 Akicma peganoides Millsp. Field Mus. Bot. 2: 416. 1916. 

 Colima ; type from some unknown locality in Mexico. 



Shrub, glabrous or nearly so ; leaves 2.5 to 8 cm. long, nearly sessile ; in- 

 volucres glabrous or sparsely puberulent, mostly in terminal cymes, the ap- 

 I)endages white, semiorbicular. 



19. Euphorbia schlechtendalii Boiss. Cent. Euphorb. 18. 1860. 

 Alectoroctonum oratunt, Schlecht. Linnaea 19: 252. 1847. 

 Euphorbia mayana Millsp. Field jNIus. Bot. 1: 304. pi. 16. 1896. 

 Euphorbia nelsonii Millsp. Bot. Gaz. 26: 268. 1898. 



Aklema ovata Millsp. Field Mus. Bot. 2: 416. 1916. 



Tamaulipas to Sinaloa, Oaxaca, and Yucatan; type from Actopan and 

 Papantla, Veracruz. Guatemala and Nicaragua. 



Shrub or small tree, 1 to 4.5 meters high, glabrous or nearly so; leavea 

 slender-petioled, the blades variable in shape, orbicular, ovate, or broadly 

 obovate, 1 to 5 cm. long, rounded to acutish at apex ; involucres in terminai 

 cymes, the appendages of the glands usually very narrow ; capsule glabrous 

 " Sac-chacah " (Yucatiin, Maya) ; " mulatilla " (Oaxaca). 



The sap is said to yield a kind of rubber. 



20. Euphorbia chiapensis T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 54. 1914. 

 Eumecanthus chiapensis Millsp. Field Mus. Bot. 2:414. 1916. 



Oaxaca and Chiapas ; type from Sierra de Tonala. Chiapas. 



Slender glabrous shrub, 1 meter high ; leaves slender-petiolate, ovate or lance- 

 orate, 3 to 6 cm. long, obtuse ; involucres in terminal and axillary cymes ; ap- 

 pendages of the glands each cleft into 2 linear lobes. 



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