121 
glabrous; branchlets elongated, very slender, terete, light brown, 
slightly flexuous, the internodes 1.5-2.5 cm. long; stipules 3-5 
mm. long, lanceolate, attenuate, brown, scarious id deciduous ; 
petioles .5—1 cm. long, very slender, partially concealed by the in- 
florescence; blades 6-8 cm. long, .75 to 1.5 cm. broad, lanceolate. 
with sub-rotund base and attenuate apex, coarsely and sharply 
short-serrate, dark green, strongly 3-nerved, the remaining vena- 
tion inconspicuous; heads of a rich brown, 7 or 8 mm. in diameter, 
very dense, closely enveloping the node and the base of petiole; 
bracts 1.5 mm. long, .5 mm. broad, oblong, obtuse; akene (flowers 
not eed less than .5 mm. long, whitish, the stigma more than 3 
mm lon 
Espirito Santo, 1891. (1191). 
Parietaria debilis Forst. Fl. Ins. Aust. Prod. 387. Vic. Cochabama, 
1891 (1099). 
BURMANNIACEAE. 
Burmannia tenella Benth. in Hook. Kew Journ. Bot. 7: (1855) 10. 
Mapiri, July-Aug., 1892 (1563). 
ORCHIDEAE 
(Determined by Mr. R. A. Rolfe.) 
Humboldtia ruscifolia (L.) Kuntze, Rev. Gen. Pl. 669. Mapiri, 
July-Aug., 1892 (1567). 
PLEUROTHALLIS COMPLICATA Rolfe sp. n. 
Stems slender, terete, 6-814 in. long. Leaves sessile, ovate- 
lanceolate, subobtuse, 5-7 in. long, 1-217 in. broad. Racemes 
ent sheath, 34 in. long, slender, longer than the leaves, many- 
flowered. Bracts tubular- infundibular, obtuse, 1 lin. long. Pedicels 
I lin. long. Dorsal oe lanceolate- -oblong, subacute, 134 lin. long ; 
lateral ones connate to apex, subacute, base very concave, I lin. 
broad. Petals linear, acute, 177 lin. long. Lip orbicular, compli- 
cate, the apical half being abruptly deflexed under the basal one, 
with the rounded sides erect, apex subobtuse. Column short and 
stout. 
Mapiri, n. 1568. 
Closely allied to the Venezuelan P. semipellucida Rchb. f., and 
having a similar dwarf lip, which is curled up in the sac of the 
united lateral sepals, yet the two are quite distinct in various de- 
tails of the flower. 
