DIDTNAMIA. AXGIOSPERMIA. 57 



with the margin inflected; lower concave, ob- 

 «o]eteIy 3-toot!iC(1, iinexpanded. Anthers un- 

 connecteil; lobes unequa!, divaricate. Capsule 

 straight, eiliptic-ovate, £!-ceUed, 2-valved, ma- 

 Dy-sccded, opening on botii sides; dissepiment 

 ti-ansverse. Seeds smali, with an alated lunate 



Annual; stem simple; leaves alternate, entire; flowers 

 axillary, alternate, sessile, and bracteate; bractes divari- 

 cately thfid. 



Species. 1. O. hiie7is. 



Rescript. Root tortuous, perpendicular, and fibrous. 

 Stem simple, hirsutely pilose, terete. Leaves increasing 

 in size upwards, alternate, sessile, lanceolate-linear, 

 acute, entire, opaque, and as m ell as the bractes and ca- 

 lix shortly and somewhat viscidly pubescent, margins sca- 

 brous; bractes cvuieate, divaricately trifid, about an inch 

 long" and the same in width, 3-nerved. Calix much shor- 

 ter than the bractes, partly compressed, striated, sub- 

 campanulate, segments linear-lanceolate, acute. Corolla 

 yellow, smooth; tube slender, about the length of the 

 calix; both of the lips concave, inflected, and closed, the 

 lower somevvl^at plaited and terminated by 3 minute den- 

 tures, so inconspicuous as to give the corolla the appear- 

 ance of being destitute of an under lip Stamina 4, small;. 

 filaments capillary, ingrafted upon the upper lip a little 

 below the orifice, approximating by pairs under the same 

 lip; anthers pale, unusually small, 2-celled, distinctly and 

 separately 2-!obed, lobes pubescent, not parallel, one 

 acute-angularly diverging from below the summit of the. 

 other, almost exactly similar to the small lamdba of tlie 

 Greek alphabet {\). Style filiform, stigma simple, minute. 

 Capsule ellip'ic ovate, obtuse, staight and pubescent,in- 

 cluded within the cilix, 2-celIed, 2-valved, many-seeded, 

 margins of the valves partlv inflected; dissepiment trans- 

 verse, or origining from tjie middle of the valves and 

 'Seminiferous. Seeds small, more than 10, having aa 

 alated interrupted margin. Cotyledones 2, very small, 

 tipon the growing plant, oval. Hab. In humid situations 

 on the plains of the Missouri, near Fort Mandan; very 

 local. Flowering in July and August- Height abou' 12 

 or 14 inches. Growing in quantities. Flowers of a bright 

 and uniform yellow, almost of the size and form of the 

 common species of Jlelampi'nan at first sight. In point 



