31 



in the axils of the leaves, 2-seeded; 



seeds obovoid, with a deep narrowly 



cuneate-obcordate groove on the 



back." Greene, pitt 3:15. Santa Cruz 



Island. 



IMPERATOR HOOKER [ Rupr. 



"Imperator brevifolia Culms 3-4 ft. 

 high, erect from a creeping rhizome, 

 firm, smooth; radical leaves numerous, 

 4-10 inches long, plain, smooth, very 

 acute, 4-5 lines wide, contracted and 

 long- ciliate at the base, ligule short, 

 membranaceou.s: cauiine leaves, 4 or 5, 

 short, first about 4 inches, second 3 

 inches, third 2 inches, fourth 1 inch 

 long-, rather rigid, acute, with a few 

 long hairs at the base; ligule short cil- 

 iate, sheaths smooth, the upper ones 

 elongated 6-7 inches long) : panicle erect, 

 nearly cylindrical, 5-9 inches long, 

 M>-% inches wide; branches of the pan- 

 icle appressed, sparsely short-hairy 

 below, with spikelets in pairs, one ses- 

 sile, and the other pedicellate, toward 

 the apex the spikelets single; the ped- 

 icels slig-htly hispid, and emitting a 

 few long silky hairs; the outer glumes 

 about li/4 lines long, the upper a little 

 longer, lance-oblong, obtusi-sh: the 

 lower five-nerved; upper 3-nerved and 

 ciliate at the apex; both villous on the 

 back with long silky hairs, which are 

 about 3 lines long; third g-lume smooth, 

 very thin, hyaline, about as long as 

 the first: fourth glume two-thirds as 

 long, narrow; palet bifid, broad, hya- 

 line, nerveless, % line long; stamen 

 one. Southern California, 1031 Parish; 

 New Mexico, 2001 C. Wright: also from 

 Arizona and Western Texas." Vasey, 

 Torr cl b 13:26 (F 1886). 



Cantilles canyon, Lower California 

 (Orcutt 1137); Grand canyon (Tou- 

 rney); Resting Springs (Coville). 

 ISOETES MEXICANA Unde*rw. 



"Amphibious: root-stock 2-lobed: Ivs 

 20-30, bright green, 12-22 cm long; sto- 

 nmta numerous: sporangia oval, 5 mm 

 long, 3 mm wide, delicate, unspotted; 

 velum very narrow, almost wanting: li- 

 gule triangular, two-thirds as long as 

 the sporangium: macraspores chalky- 

 white, 0.25-0.375 mm thick, nearly 

 smooth, the 3 converging ridges in 

 strong relief: mlcrospores slate-colored, 

 0.028-0.033 mm thick, mostly smooth." 

 Underwood, bot gaz 13: 93 (Ap 1888). 

 Slow streams, base of Sierra Madre, 



State of Chihuahua, Mexico, O 1887 

 (JbTingie 1447). 



Specimens referred to this by Under- 

 wood, from San Diego mesas, and from 

 Baja California (and so listed in Or, W 

 Am Sci 10: 156), are identified by Eaton 

 as varieties of melanopoda and orcuttii, 

 ISOETES MELANOPODA J. Gay. 



"Polygamous; trunk suoglobose, 

 deeply bhobed; Ivs slender, stiff, erect, 

 bright green, usually black at base Uo- 

 60 in number, 5-10 or rarely even 18 

 inches long), sporangia mostly oblong 

 (2-4 or even 5 nnes long), spotted, with 

 narrow veium, iiguia triangular-subu- 

 late; macrospores among the smallest 

 in the genus, 0.25-0.40 mm in diam, with 

 depressed tubercles often confluent into 

 worm-like wrinkles, or almost smooth; 

 microspores also smaller than usual, 

 0.023-0.028 or rarely 0.03 mm long, spin- 

 ulose." E, St. Louis ac tr 4: i>86-7 

 (1882). 111.; Iowa; Chico, Cal. 



Variety PALL1DA Engelmann. 



"A larger plant, If- oases pale, velum 

 usually much broader, covering one- 

 fourth or one-third of the sporangium; 

 macrospores only 0.3-0.35 mm thick." 

 E, St. Louis ac tr 4: 387 (1882). Hous- 

 t<jn, Texas (E. Hall). Mesas, SD (Or, 

 My 1903). 



Variety CALIFORNICA A. A. Eaton. 



"Amphibious monoecious. Trunk bi- 

 lobed: 2 cm broad: bulb 4 cm in diame- 

 ter. Leaves 20-100 10-30 cm long, 3 mm 

 broad, flat above, rounder! on back, ta- 

 per-pointed, white or fuscous at base, 

 with many stomata and 4-6 cardinal 

 and several accessory bract-bundies. 

 Velum Vz-Vz indus.a.e sporangium with 

 few or many spots. Gynospores 278-500 

 u, average 460 u, smooth with a few 

 fragmentary crests or vermiform with 

 wrinkles: androspores 26-35 u light 

 brown, densely echinate. Differs 

 Trom type and Var. pallida, principally 

 in the larger, usually smooth gyno- 

 ppores and larger androspores. Olema, 

 Cal. Mrs. Brandegee, Miss Eastwood. 

 Also Powder Mill Canyon, Santa Cruz, 

 Gala., C. H. Thompson. Type in Herb. 

 A. A. Eaton. Cotypes in Herb. Mo. Bot. 

 Garden and University of Minnesota." 

 Eaton in Gilbert List N A Pterido- 

 phyfces, 27 (1901). 



"Note, July, 1903. I have seen no po- 

 lygamous tendency in this, so marked 



