Ebjtraria. ACANTHACEiE. 323 



spreading and plane, or the posterior (interior in the bud) at first concave-infolded and 

 less spreading. Stamens nearly equalling the corolla-lobes. Capsule ovate, acuminate, 

 obcompressd, on a slender clavate stipe. Seeds very flat, minutely scabrous. 



8. ANISACANTHUS. Cornlla with elongated tube gradually somewhat wider at the 

 throat ; the 4 lobes similar, lanceolate, entire, erectish recurving; the posterior (or upper 

 lip) rather more deeply separated. Stamens and style equalling or exceeding the corolla- 

 lobes. Capsule ovate on the long clavate stipe. Seeds smooth or rugulose. 



++ ++ Antlier-cells unequal or unequally inserted, one lower than the other or oblique ; 



= The lower calcarate or mucronate at base ; corolla manifestly bilabiate ; upper lip 

 erect and more or less concave, merely eniarginate or 2-lobed at apex, not surpassed by 

 the stamens; these inserted in or near the throat : calyx 5-parted (sometimes 4-parted), 

 small. 



9. SIPHONOGLOSSA. Corolla with long-linear or filiform tube and short limb ; lower 

 lip broad and spreading, 3-cleft. Anther-cells contiguous and parallel, but one liigher. 



1 0. BELOPERONE. Corolla deeply bilabiate, but with tube much longer than limb ; 

 throat narrow ; lower lip .3-lobed at apex, erect-spreading. Anther-cells somewhat unequal 

 and oblique, on a more or less dilated connective. Seeds globular or tliickened! 



1 1. JUSTICIA. Corolla with short tube, and ratlier amphate throat seldom longer than 

 the limb ; lower lip spreading, 3-lobed. Anther-cells oblique and disjoined. Seeds, as far 

 as known, flat. 



^ = Anthers muticous, or both cells rarely mucronulate at base : calyx deeply 5-parted 

 into narrow or subulate divisions, the fifth commonly smaller : stamens not surpassing 

 the corolla. 



12. DIANTHERA Corolla bilabiate; upper lip erect and concave or fornicate, entire or 

 2-toothed ; lower spreading and 3-lobed, with a rugose or venose-reticulated convex base 

 or palate. Anther-cells ovate or oblong, not parallel, moderately or conspicuously dis- 

 joined on a dilated connective. Seeds glabrous, smooth, or echinulate-scabrous. Bract- 

 lets small. 



13. GATESIA. Corolla with slender tube, somewhat ampliate throat, and almost equally 

 4-lobed spreading limb ; lobes nearly similar, plane, ovate. Anther-cells oblong, contig- 

 uous and similar, but one a little lower and oblique. Stigma eapitellate. Seeds gla- 

 brous, minutely rugulose. Spikes short and dense : bracts and braetlets membranaceo- 

 foliaceous, 1-nervetl and pinnately veined or triplinerved. 



H— -f— Placentae, by rupture of half-partition from the base upward, at length separating 

 and diverging or incurving : anther-cells muticous, or rarelj' one or both mucronulate 

 at base: calyx small, dry, or somewhat glumaceous, 4-o-parted ; the divisions subulate 

 or linear-lanceolate, equal, or the innermost (posterior) smaller : corolla with narrow 

 tube : filaments filiform. 



14. TETRAMERIUM. Flowers solitary (rarely 2 or 3) covered by a large and herbaceous 

 primary bract, and subtended by two small and narrow braetlets. Corolla with an almost 

 equally 4-parted limb, or somewliat bilabiate ; the 3-parted and widely spreading lower 

 lip rather more separated from the less spreading or rather erect and slightly concave 

 entire and obovate or oblong upper lip. Anther-cells equal and parallel or nearly so, 

 eitlier contiguous or separated by a slightly dilated connective. Seeds flat, muriculate 

 or papillose. Spikes strobilaceous, quadrifarious. 



15. DICLIPTERA. Flowers not covered by primary bracts (of main axis), but involu- 

 crate (either singly or in a fascicle) by 2 valvately opposed and nearly equal or 4 less 

 dilated and unequal herbaceous braetlets. Corolla deeply bilabiate ; upper lip erect, con- 

 cave or plane, entire or emarginate ; lower spreading, entire or 3-lobed at apex. Anthers 

 witli a narrow connective. Seeds either smooth or muriculate. Inflorescence various, 

 not strobilaceous-spicate. 



1. ELYTRARIA, Michx. ("EXvtqov, a case or cover, the scape or pe- 

 duncle and spike covered with imbricated bracts.) — Low perennial herbs (chiefly 

 tropical American) ; with leaves crowded at base of a naked scape or at summit 

 of .a short naked stem, tapering to the base, thinnish ; flowers small, solitary and 

 sessile under the bracts ; these and the scales of the scapes rigid-chartaceous or 

 glumaceous, alternate ! — Michx. Fl. i. 8 (1803); Yahl, Enum. i. 106 (1804), 

 excl. spec. 



B. virgata, Michx. Acaulescent: leaves from oblong to elongated spatulate, obtuse (2 

 to inches long), witl\ usually undulate mai'gins: scape a foot or less high, bearing a short 



