FERNALD. — LITTLE KNOWN MEXICAN PLANTS. 415 



Andes, Jameson. Bolivia : Yungas, Bang, no. 395. Brazil : Riedel , 

 Claussen; Herb. U. S. So. Pac. Expl. Exp., no. 27 ; Prov. Minas Ge- 

 raes, Widgren, no. 984^. Burchell's no. 2223, from Brazil, of which 

 the specimen in the Gray Herb, shows only the tip of a stem, is per- 

 haps referable to var. valid um. 



** Branchlets spreading or recurved, forming a regular flabelliform spray; 

 ultimate branchlets usually short, 0.5 to 4 cm. long, broad as in L. com- 

 planatwn but with shorter leaves. 



Var. flabelliforme Fernald. Peduncles usually bearing 4 spikes. 

 — Rhodora, iii. 280 (1901). L. complanatum Amer. auth. in part. — 

 North America : Nova Scotia to the mountains of North Carolina, 

 Kentucky, Iowa, and Minnesota. 



Var Wibbei Haberer. Peduncles 1-spiked. — Rhodora, vi. 102 

 (1904). North America : northern Vermont and central New York. 



IV. NEW AND LITTLE KNOWN MEXICAN PLANTS, 

 CHIEFLY LABIATAE. 



By M. L. Fernald. 



Juncus albicans, n. sp., caespitosus ; caulibus 5-7 dm. altis tenu- 

 ibus striatis albido-viridibus ; vaginis basilaribus laxis albicantibus 

 demum fuscis, auriculis cartilagineis, laminis subteretibus anguste 

 canaliculars ; inflorescentiis decompositis 2-6 cm. longis, ramis sub- 

 erectis, floribus subremotis vel aggregatis ; bractea infima frondosa 

 inflorescentiam plerumque superante ; floribus 4-5 mm. longis albido- 

 stramineis ; bracteolis tenuibus albicantibus ; sepalis petalisque subae- 

 quilongis patentibus lanceolatis apice subulatis anguste membranaceo- 

 marginatis ; staminibus 6 sepalis circa dimidio brevioribus, antheris 

 filamentisque aequantibus ; fructibus trigono-ellipsoideis truncatis 

 breve mucronatis 3-4 mm. longis pallide stramineis nitidis ; seminibus 

 0.5 mm. longis oblique ellipsoideis brevissime albo-caudatis. — Chi- 

 huahua : vicinity of Chihuahua, altitude about 1300 m., May 1-21, 

 1908, Edward Palmer, no. 161 (type, in Gray Herb.). [It should be 

 noted that two plants have been distributed under no. 161, but, as the 

 other belongs in the Cruciferae, little confusion is likely to result.] 

 Nearly related to J. dichotomies Ell. of the southern and eastern United 

 States. Differing in its very pale color, the softer texture of the pro- 

 phylla, perianth, and capsule, and the distinctly white-caudate longer 

 seeds. 



Palmer's no. 253, collected May 28-31, 1906, at Tobar, Durango, is 

 provisionally placed with Juncus albicans, though it may eventually 



