354 ORDER 152. XYRIDACE^E. 



2 T. pilowa Lchm. Umbels sessile, terminal and axillary; leaves lanceolate, hairy 



bothjsides ; flowers small, bluish purple. Banks, 111. to O., and S. 2f. 



3 T. rosea MX. Umbels terminal, pedurmlate, with subulate bracts ; leaves linear ; 



petals rose-colored, twice longer than the smooth calyx. May. If. 



4 T. CRASSIFOLIA. From Mexico, a trailing leaf-plant, in vases and baskets, with thick 



ovate leaves, variegated with purple, green, and white. Flo-.vers roseate. 



3. MAYACA, Aubl. Stamens 3, opposite the sepals. Caps. 1-celled. 

 Seeds several, attached to the middle of the valves. xy Moss-like, creep- 

 ing, branching, beset with narrow, linear leaves. Peduncles solitary, axil- 

 luiy, l-flo\veml. Bescnibles a Sphagnum. 



Iff. Micliauxii Schott. & Endl. Ted. longer than the Ivs. (which are 23"), rcficxcd 

 in fruit; pod 9-12-peeded ; petals white. Shallow waters, Va. to Fla. July. 



ORDER CLII. XYRIDACE.E. XYIUDS. 



Herbs sedge-like, with cquitant leaves and a scape bearing a head ot 

 regular Iriandrous flowers. Perianth of 3 glumaceous sepals and 3 colored 

 petals. Fertile stamens on the claws of the petals. Style 3-cleft. Capsule 

 3-valved, oo-seeded. 



XYRIS, L. YELLOW-EYED GRASS. Head of flowers ovoid-cylindrical, 

 invested with an armor of cartilaginous scales. One sepal membranous, 

 involving the yellow corolla in bud, the 2 lateral strongly keeled, persistent. 

 Pet. crenulate, on claws, caducous. 3 sterile sta. alternately w r ith the 3 fer- 

 tile. 2{ Lvs. radical, linear, sheathing the base of the slender scape. Jn.-Aug. 



* Scape 2- edged above (except No. 6). Lvs. long, linear, flat, often twisted. . .(x) 



* Scape teretish, its Ivs. shorter than its sheath (No. !)) or longer, and filiform.. .No. 8 



x Sepals exceeding the bract, and fringed on the winged keel Nos. 6, 7 



x Sepals (the 2 lateral) included, y winged and ciliate on the keel NOB. 35 



y wingless or very nearly so Nos. 1, 2 



1 X. fiexuosa Muhl. Common X. Scape 618', often bulbous at base ; Ivs. narrowly 



linear, 39', often twisted ; head round-ovoid, %'; sepals minutely bearded at the 

 tip, lance-oblong, quite wingless on the keel. N. Eng. to 111. and Ga. 



2 X. ambigua Beyr. Scape 2 3f; Ivs. broad-linear, rough-edged, 612' ; hd. lance- 



oblong, 9 15" ; sepals lanceolate, slightly winged ; petals large (("). Barrens, S. 



3 X. Caroliniana Walt. Scape 1 2f, the broad-linear Ivs. more than half as long; 



hd. yellowish-brown, (59" ; sep. obscurely fringed ; pet. 45". Swamps, Mass, to Fla. 



4 X. Elliot til Chapm. Scape 2-cdged throughout, 1 Hf; Ivs. narrow-lin., as long; 



hd. obovoid, 4 5"; sep. cut-fringed on the wing; pet. 3". Wet barrens, S. Car. to Fla. 



5 X. platylopis Chapm. Scape 2 3f, twisted, as well as the broad-linear Ivs. ; hd. 9 



18". pale ; sepals fringed at the apex, wing narrow ; petals 2 3''. Sands, S. Car. to Fla. 



C X. torta Sm. Bulbous ; te> - cte scape and rigid Ivs. twisted ; hd. oval to oblong, 5 9" ; 



sepal fringe exserted ; petals large, roundish, 8". Sand, N. J. to Fla. (X. bulbosa K.) 



7 X. fimbriata Ell. Scape rough, 2 3f, the broad-linear Ivs. nearly as long ; hd. largo, 



ovoid, 9 12" ; sepals much fringed and exserted ; petals small (3 4"). N. J. to Fla. 



8 X. Bald \viiiiaiia K. & S. Scape 618', twice longer than the filiform bristle-point- 



ed leaves ; head oval, 24" ; sep. falcate, keel winged, ciliolate. Fla. (X. filifoliaCh.) 



9 X. brcvf folia MX. Scape 4 12'; Ivs. linear to subulate, $ -2'. spreading two ways; 



head oval, 23"; sep. wingless ; pet. 2". Wet places, S. (X. flabolliformis Chapin.) 



