644 , RHIZOCARPE^. 



dense, spiciform raceme : bracts ovate-lanceolate, about as long as the ovary ; perigonial 

 divisions exterior lateral reflexed, 2 interior 2-partite : their anterior segments setaceous ; 

 lip 3-pariile : segments Hnear-setaeeous, subequal : spur little longer them the ovary, curved, 

 filiform; "appendages of the stigma falcate." — Orchis setacea, Jacq. 0. monorrhiza, Sw. 

 {ex parte; H. brachyceratitis, W.). — Tubers single ; stem often spotted, ] J'-3' high ; ra- 

 ceme 3"-8", flowers 5"'-6'", spur 9"'-10"' long. — Has. Jamaica !, ^ coll., in grassy plains ; 

 Dominica I, Imr,, S. Vincent !, Guild. ; Trinidad !, Cr., Bradf. ; [Cuba 1 to New Granada !]. 



334. H. setacea, Lindl. (ex descr.). Slender; leaves linear-setaceous, distant; 

 flowers yellow, distant in a 5— 8-flowered, narrow spike : bracts ovate-lanceolate, acuminate, 

 a little exceeding or as long as the long, incurved ovary ; perigonial divisions exterior 

 lateral reflexed, oblong, bluntish, superior ovate, 2 interior 2-partite : their anterior seg- 

 ments setaceous, as long as the oblong-linear posterior ones ; lip S-partite: segments linear, 

 subequal: spur as long as the ovary, -filiform, straightisli-deseending ; appendages of the 

 stigma short, thickish, rounded. — Habit of H. heptadactyla, G. Rchb. !, but lip-segments 

 narrower. About 1' high; inferior leaves li"-2" long, 1" broad at the base; spike 3", 

 bracts aud spurs about 6'", perigone and lip 2'" long. — Hab. Trinidad !, Pd., Cr., in savan- 

 nahs; [Brazil (im(^^.)]. 



325. H. mesodactyla. Or. («. ip.). Slender ; leaves linear-setaceous, distant; flowers 

 very distant in a 3-5-flowered spike ; bracts ovate-lanceolate, acuminate, little exceeded by 

 the incurved ovary ; perigonial divisions exterior lateral reflexed, oblong-lanceolate, superior 

 deltoid, 2 interior 2-partite : their anterior segments setaceous, twice as long as the linear 

 posterior ones ; lip S-partite : segments filiform : middle twice as long as the lateral ones : 

 spur little shorter than the ovary, filiform, somewhat clavate, descending ;_ appendages of the 

 stigma short, thickish, rounded. — Nearly allied to the preceding, with which it grows inter- 

 mingled {Cr.), and some characters depend perhaps upon the more advanced state of deve- 

 lopment in which this was collected. Habit and proportions the same, but stem rather higher, 

 flowers more distant, and lip-segments narrower. — Hab. Trinidad !, Cr., in savannahs, 

 Piarco. 



** Perigonial divisions undivided. 



226. H. alata, Boole. I Leaves lanceolate-acuminate ; flowers in a slender, many- 

 flowered spike : bracts oblong-lanceolate, exceeding the winged ovary ; perigonial divisions, 

 exterior ovate-lanceolate, pointed, lateral reflexed, 2 interior lanceolate, entire ; lip as long as 

 the perigone, entire, filiform, minutely 2-dentate at the base ; spur little shorter than the 

 ovary, ckvate-filiform, curved ; appendages of the stigma oblong, blunt. — H. brachyceras, 

 Lindl. I (Orchis monorrhiza, Sw. ex parte, sec. Lindl^. — 1^'-3' high, leafy ; spike 2"-6", 

 bracts 8"'-10"', flowers 3"'-4"', spur 4'"- 5"' long.— Hab. Jamaica!, all coll., in marshes 

 and savannahs ; Antigua!, Wullschl., S. Ymceat \, Guild.; [Cuba!]. 



cryptogamj: yasculares. 



CXLIX. EHIZOCAEPEJ;. 



Sporangia and aniheridangia included by conceptacula, the latter axillary, petiolar or 

 from the contracted axis. — Aquatic herbs. 



1. MAKSILBA, i. 



Conceptacula common to the monosporous sporangia aud the antheridangia, longitudi- 

 nally 2-valved, many-celled : cells transverse, 2-seriate.— Leaves i-foliolate : petiole slender, 

 eircinafe in the bud. 



