644 RHIZOCARPE.E. 



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 'i-partife : segments linear-setaceous, subequal : spur little longer than the ovary, curved, 

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

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

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

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



224. 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-parlite : segments linear, 

 subequal : spur as long as the ovary, filiform, straighiish-descnidivg ; appendages of the 

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

 narrower. About 1' high ; inferior leaves l|"-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 (Lindl.)']. 



225. H. mesodactyla, Or. (n.sp.). 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-partile : segments filiform .- middle ticice 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, Hook. ! 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, clavate-filiform, curved ; appendages of the stigma oblong, blunt. — H. brachyceras, 

 Lindl.! (Orchis monorrhiza, Sw. ex parte, sec. Lindl.). — 1£'-3' high, leafy; spike 2' -6 , 

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

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



CRYPTOGAMS YASCULARES. 



CXLTX. KHIZOCAEPEiE. 



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

 from the contracted axis. — Aquatic herbs. 



1. jy.lAtt3l.LEA, L. 



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

 nally 2-valved, many-celled : cells transverse, 2-seriate.— Leaves 4-foliotale : petiole slender, 



