166 Robinson and Greenman—Mexican Plants. 
acuminate both ways, glabrous, 3-nerved, including the petiole 
4 to 5 inches long, half inch broad: stems a foot or more in 
height, smooth or somewhat pubescent: scales oblong-lanceolate, 
sharply acuminate: floral bracts ovate to elliptic-lanceolate, 
acuminate, 4 to 6 lines long, about equalling the ovary: spike 
many-flowered, 4 to 7 inches long; lower flowers sometimes scat- 
tered; the upper imbricated; perianth nodding; sepals narrowly 
oblong, obtuse, 3-nerved, 2 lines long, not noticeably decurrent 
upon the ovary; lateral petals spatulate, obtuse, 1-nerved, equal- 
ling the sepals; labellum shortly unguiculate, oblong, obtuse, 2 
lines long; the blade shortly and inconspicuously auricled at the 
base; margin slightly wavy, inflexed near the apex; callosities 2, 
two-thirds the length of the labellum, bright red: fruit 5 lines 
long.—Collected by C. G. Pringle, chiefly under Arbutus, in cool 
porphyritic gravel, Sierra Madre, Chihuahua, October, 1887 (No. 
1373); and on dry ledges under firs, Sierra de las Crucis, 20 
August, 1892 (No. 5326). Mr. Pringle’s two plants differ only in 
the fact that in the first mentioned the stem and inflorescence 
is sparingly pubescent, in the other quite glabrous.’ 
SISYRINCHIUM ALATUM Hook. var.? aneustTisstmum. Erect 14 
feet high: root a cluster of elongated tough fibres somewhat 
thickened below : stems scarcely at all flexuous, only 1 to 14 lines 
in breadth : cauline leaves 4 to 12 inches long, 13 to 2 lines broad, 
erect: flowers and fruit as in the typical form but spathes more 
slender.—Collected by C. G. Pringle, on the Sierra de San Felipe, 
altitude 9,500 feet, 22 June and 29 August, 1894 (No. 4703). 
The tall slender erect stems and narrow elongated leaves are so 
different from the original form of the species that the present 
plant would have appeared distinct but for the occurrence of a 
good intermediate in Mr. J. Donnell-Smith’s No. 1297 from 
Guatemala, and the well known polymorphous character of the 
species. 
SISYRINCHIUM EXALATUM. Erect, 14 to 2 feet or more in 
height: root a cluster of long stout but scarcely tuberous fibres ; 
stem terete, smooth, 3—5-leaved, ending in several dichotomous 
flexuous branches, subtended by linear-lanceolate bracts: leaves 
linear attenuate; the outermost basal 2 to 4 inches long, 2 lines 
broad, flat; the inner basal and lower cauline elongated, 8 to 18 
inches long, 2 to 3 lines broad; the upper shorter, bractlike : 
clusters of flowers solitary, terminal on the branches, 3—5-flowered ; 
outer spathes 14 to 22 lines long, exceeding the inner: perianth 
golden yellow; the outer divisions obovate, short-acuminate, 
about 4 lines long, 2 lines broad; the inner slightly smaller: 
filaments united for about a third of their length; anthers oblong- 
linear, about 3 lines in length: young capsule pubescent, short- 
obovoid, 3 lines long.—Collected by L. C. Sraith on the Cuilapan 
Mountains, Oaxaca, altitude 7,000 feet, 27 June, 1894 (No. 52). 
SISYRINCHIUM PoLycLADUM. ‘Tall, much branched and very 
leafy above, 14 feet high, drying green: root fibres nimerous, 2 
to 4 inches long, fusiform-thickened near the ends: stems erect, 
