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PHENAX PALLIDA Sp. n. 
Slender shrub, the branchlets elongated, spreading, slender, 
terete, purple, striate, above clothed with divergent soft white eid 
petioles s stout, 5-10 mm. long, blades 5-10 cm 2- 
broad, oblong, the base acute, the apex acuminate, flabellately ei 
costate, penni-veined so as to connect the ribs, sharply serrate, thick- 
ish and rigid, above finely strigose, dark green, beneath very pale, 
hispid-hairy ; glomerules closely sessile, solitary in the axils and 
clothing the leafless branchlets, 4-5 mm. in diameter, brown; 
rudimentary pistil little larger than an anther, the stigma e as 
large as the ovary ; pistillate flower very short-stalked, 1.5 m 
long, light brown, shining, narrowly margined, the subulate ber 
- and stigma about as long as the ovary. 
Yungas, 1890 (341). 
CERATOPHYLLEAE. 
Ceratophyllum demersum L. Sp. Pl. 992. Talca Chugiaguilla, Apr. 
1890 (800). 
GNETACEAE. 
Ephedra Americana Willd. Sp. 4: 860. Vic. La Paz, 10,000 ft. 
^. 1889 (9). 
HYDROCHARIDEAE. 
Elodea Chilensis Casp. Abhandl. Berl. Acad. 1857: 47. Lake 
Titicaca, 1890 (165). 
ORCHIDEAE. 
(Communicated by Mr. R. A. Rolfe.*) 
PLEUROTHALLIS YUNGASENSIS Rolfe n. sp. 
Stems slender, terete, about a foot high. Leaf oblong-lanceo- 
late, acuminate, with subcordate base, 6-8 in. long, 114-134 in. 
broad. Flowers fascicled from a little above the base of the leaf; 
pedicels slender, 2-277 in. long. Dorsal sepal ov: te, acute, 7—9 
lin. long, 4-5 lin. read: lateral sepals connat., el.:ptical-oblong, 
acute, 9-12 lin. long, 6-8 lin. broad. Petals subulate-lanceolate, 
acute, base subcordate, 3% lin. long, ı lin. broad. Lip reniform- 
*As this communication is accepted in the form submitted by Mr. Rolfe, the same 
rules of nomenclature do not apply as those which determine the names elsewhere. 
H. H. R. 
