268 BOTANY. 



Western New Mexico and Northern Arizona ; Rocky Canon, Roth- 

 rock (274), in 1874. Parry, Bischoff, only fruit. Dr. Rothrock's observa- 

 tions and very complete specimens enabled me to give a connected account 

 of this species, of which fragments only had been known for many years. 

 Rev. Mr. Greene noticed the abundant secretion of a sweetish liquid filling 

 the tube, which has also been observed in other species. The rootstock is 

 used as a substitute for soap by the natives, under the name of Amole, 

 much like that of Yucca, and, when roasted, is considered a great delicacy, 

 named Mezcal. 



Agave Palmebi, Engelm. Agave, I. c. 319. — Stemless ; leaves lance- 

 olate, 10-20' long by 2-2 J' wide, attenuate into a slender, terete, narrowly 

 channelled, brown spine ; marginal teeth flexuous or recurved, dark brown; 

 scape as in the last ; panicle loosely branched ; flowers 2' long ; perigon 

 whitish, lobes a little shorter than tube, stamens from its middle, and, 

 together with anthers and style, long exsert, purplish ; capsule cylindric, 

 stipitate ; seeds small, roughish. 



Camp Bowie, Arizona, Rothrock (496), 1874; Palmer, in Southern 

 Arizona. Similar to the last, but readily distinguished by its longer, nar- 

 rower leaves and the other characters enumerated. Used for the same 

 purposes as the last. 



ALISMACE^E. 



Triglochin palustre, L. — South Park, Colorado (952). 

 Triglochin maritimum, L. — Alkaline plains of South Park and San 

 Luis Valley, Colorado (942, 951). 



NAIADES. 



Potamogeton gramineus, L., var. heterophyllus, Fries. — South Park, 

 at 10,000 feet elevation (961). No mature fruit. 



Potamogeton perfoliatus, L., var. lanceolatus, Robbins? — Twin 

 Lakes, Colorado (960). 



Potamogeton marinus, L. — Twin Lakes and San Luis Valley, Colo- 

 rado (955). 



Potamogeton pectinattjs, L. (959). 



Naias major, Roth. — Huntington Valley, Nevada. 



