Didiptera. ACANTHACEiE. 331 



T. platystSgium, Torr. 1. c. Scabrous-puberulent, not at all hirsute : leaves oblong- 

 lanceolate : bracts subcordate, mucronate-acuminate (half or two-thirds inch long), lightly 

 3-5-plinerved and veiny : bractlets minute and subulate : calyx 5-parted : tube of purple 

 corolla longer than the narrowly oblong lobes : seeds muriculate-scabrous. — S. borders of 

 Texas, near Ringgold Barracks on the Rio Grande, Schott. 



15. DICLIPTERA, Juss. (/Ji-/.h\; two-valved, and titsqov, wing : applies 

 to the involucre of the typical species, but was explained to relate to the bipar- 

 tition and separation of the two parts of each valve of the capsule after dehiscence.) 

 — Chiefly herbs, dispersed over the warmer regions of the world. Fl. summer. 

 Corolla often seemingly resupinate as relates to primary axis, on account of the 

 cymose inflorescence or the evolution of more than one flower in the involucre. 

 Leaves petiolate. In the disruption of the valves of the capsule, the sides are 

 usually carried away with the placentae, leaving only a stalk-like base. 



§ 1. Eudiclipteha. Bractlets of the flat involucre a single pair and broad, 

 opposite : internal bractlets small and thin like the sepals : anther-cells oval, dis- 

 joined, one nearly over the other. 



D. resupinata, Juss. A span to a foot or two high from an annual or perennial root, 

 nearly glabrous : stem 6-angled : leaves from ovate to lanceolate or oblong : involucres on 

 naked simple or commonly trifid peduncles, 1-3-rIowered, rotund- or deltoid-subcordate, 

 rarely round-obovate, very flat, a third to half inch long and nearly as wide : lobes of the 

 purple corolla obovate. — Ann. Mus. ix. 268 ; Nees in DC. Prodr. xi. 474 ; Torr. Bot. Mex. 

 Bound. 125. Justicia sexa?igularis, Cav. Ic. iii. 2, t. 203. ■/. resupinata, Vahl, Enum. i. 114. 

 Didiptera thlaspwides, Nees, 1. c. \ S. Arizona (and California ? Coulter), Thurber, Schott, 

 Wright, &c. (Mex.) 



D. brachiata, Spreng. A foot or two high, from almost glabrous to pilose-pubescent : 

 stem G-angled, rather slender, with numerous spreading branches : leaves oblong-ovate, 

 mostly acuminate, membranaceous (2 to 4 inches long), slender-petioled : involucres clus- 

 tered in the axils and more or less paniculate, short-peduncled and subsessile, somewhat 

 convex, or at length ventricose, its valves narrowed at base, 3 to 5 lines long, from broadly 

 obovate with rounded summit to spatulate-oblong, often unequal, frequently mucronate or 

 mucronulate : lobes of the purple or flesh-colored corolla elongated-oblong, half inch or 

 less long, about the length of the slender curved tube. — Syst. i. 80 ; Nees, 1. c. ; Chapm. 

 Fl. 305. D. resupinata, Nutt. in Trans. Am. Phil. Soc. n. ser. v. 183, not Vald. D. glandulosa, 

 Scheele in Linn. xxi. 705, a villous-pubescent form. — Shady and moist ground, N. Caro- 

 lina to Florida and Texas. 



Var. attenuata, a form with the involucral valves narrower, spatulate or oblong, and 

 cuspidate-acuminate; and attenuate-acuminate leaves on long (sometimes 2 inch) petioles. 

 — E. Texas, Wright. Also Arkansas, Nultall: therefore his D. resupinata, in part; but not 

 according to his character " bracteis bivalvibus subcordatis." 



§ 2. Dactylostegium. Bractlets 2 and narrow, and at base supplemented by 

 and sometimes partially concreted with a smaller and alternate pair, being the 

 outer and larger of the internal bractlets : anthers oblong-sagittate, the cells 

 usually parallel and equal : flowers loosely secund-spicate or paniculate : primary 

 bracts small and subulate. — Dactylostegium, Nees in Fl. Bras., Oersted. § Dac- 

 tylostegice, Nees in DC. Prodr. 



D. assiirgens, Juss. 1. c. Glabrous or puberulent : stem 1 to 3 feet high, with virgate 

 branches : leaves ovate, acuminate, or the smaller upper ones oblong and obtuse : invol- 

 ucres chiefly sessile and rather sparse in the slender simple or paniculate spikes : principal 

 bractlets of the involucre linear-spatulate, 4 or 5 lines long, 1-nerved, mucronate, nearly 

 twice the length of the slender-subulate interior ones : corolla much cxserted, an inch long, 

 red or crimson, arcuate ; the nearly entire lanceolate-oblong lips shorter than the upwardly 

 ampliate tube. — Nees in DC. 1. c. 489 ; Chapm. Fl. 305. Justicia assurgens,~L. (P.Browne, 

 Jam. 110, t. 2, fig. 1.) —Eastern S. Florida. (W. Ind., Centr. Am,) 



