354 ORDER 152. XYREDACE^. 



2 T. pilosa Lehm. Umbels sessile, terminal and axillary; leaves lanceolate, hairy 



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



3 T. rose a MX. Umbels terminal, pedurvulate, 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. Flowers roseate. 



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

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

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

 lary, 1-flowered. Resembles a Sphagnum. 



HI. Ittieliauxli Schott. & Endl. Fed. longer than the Ivs. (which are 23"), reflexcd 

 in fruit ; pod 9-^2-seeded ; petals white. Shallow waters, Va. to Fla. July. 



ORDER CLII. XYRIDACE^E. XYRIDS. 



Herbs sedge-like, with equitant leaves and a scape bearing a head of 

 regular triandrous flowers. Perianth of 3 gluinaceous 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 with the 3 fer- 

 tile. U 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. 9) 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. 3 5 



y wingless or very nearly so Nos. 1, 2 



1 X. flexuosa Muhl. Common X. Scape 6 18', often bulbous at base ; Ivs. narrowly 

 - linear, 3 9', often twisted ; head round-ovoid, 3 4"; sepals minutely bearded at the 



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



2 X. ambigua Beyr. Scape 2 3f; Ivs. broad-linear, sough-edged, (> 12'; hd. lance- 



oblong, 9 15" ; sepals lanceolate, slightly winged ; petals large (6"). Barrens, S. 



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



hd. yellowish-brown, 6 9" ; sep. obscurely fringed ; pet. 4 5". Swamps, Mass, to Fla. 



4 X. Klliottii Chapm. Scape 2-edged throughout, 1 Iff; Ivs. uarrow-lin., | as long; 



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



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



IS", pale ; sepals fringed at the apex, wing narrow ; petals 23". Sands, S. Car. to Fla. 



C X. torta Sin. Bulbous ; terete scape and rigid Ivs. twisted ; hd. oval to oblong, 59" ; 



sepal fringe exserted ; petals large, roundish, 8". Sand, N. J. to Fla. (X. btilbosa 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. Baldwiiiiana R. & S. Scape 6 18 7 , twice longer than the filiform bristle-point- 



ed leaves ; head oval, 2 4" ; sep. falcate, keel winged, ciliolate. Fla. (X. filifolia Ch.) 



9 X. brevifolia MX. Scape 412' ; Ivs. linear to subulate, j 2', spreading two wftys; 



head oval, 2 3"; eep. wingless ; pet. 2". Wet places, S. (X. flabelliformis Chapin.) 



