120 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 13 



tent streams have regular perennial flows through their steep rocky 

 channels in the canyons of the Sierra Laguna and to the north along the 

 east face of the Sierra Giganta. It has not been collected north of Puerto 

 Escondido, but may occur as far north as the sierras west of Muleje. 

 The leaves are small and more lucid than glaucous. Typical specimens 

 appear in Plate 10, fig. 23. 



COMMELINACEAE 



CoMMELiNA ELEGANS H.B.K., Nov. Gen. & Sp. 1:259. 1851. 



San Jose del Cabo, February 17, Dawson 1225. 



Widespread in the region of summer rainfall from northern Mexico 

 to Central America; type from "ad ripas fluvii Juanambu, alt. 760 

 hexap.," central Mexico. A low polypodial perennial herb with bright 

 blue frosty flowers and thick fibrous roots. 



Amaryllidaceae 



Agave chrysoglossa Jtn., Proc. Calif. Acad. Sci. IV, 12:998. 1924. 



San Pedro Nolasco Island, March 29, Rempel 300. 



This distinctive Agave of the subgenus Littaea is characterized by 

 the unarmed leaf margins, geminate flowers, and small capsules (2 cm 

 long) and is known certainly only from San Pedro Nolasco Island. The 

 above collection, with missing fruit and flowers, is apparently the second 

 collection. The species apparently flowers through March and April. 



Agave dentiens Trel., Rep. Mo. Bot. Gard. 22:51, pi. 38-40. 1911 

 South end of San Esteban Island, March 27, Rempel 295. 

 Described from San Esteban Island, the extent of its range is un- 

 certain, but it most likely occurs on adjacent islands. I cannot agree with 

 Johnston (Proc. Calif. Acad. Sci. IV, 12:996-997) in assigning the San 

 Esteban plants to Agave deserti. In comparing them with the popula- 

 tions on Angel de la Guardia Island, he apparently was misled by inter- 

 grading or hybrid plants. The above specimen with its linear-lanceolate 

 leaves and its distinctive deciduous or "friable" mammilloid marginal 

 prickles shows no close relation to plants of A. deserti at the type locality, 

 San Felipe, California and which I have observed. Until more material 

 and evidence is obtained, it appears appropriate to maintain the San Es- 

 teban plants as specifically distinct. 



Agave Oweni Jtn., Proc. Calif. Acad. Sci. IV, 12:999. 1924. 

 Ensenada de San Francisco, Sonora, March 30, Rempel 311. 

 Apparently endemic to the mountains about Guaymas; the type from 

 an islet in Guaymas Harbor. Except for the smaller marginal prickles 



