534 ORDER 87. ACANTHACE^E. 



1. THUNBER'GIA, L. (In honor of C. P. Thunlcrg, Prof, of Bot. at 

 Upsal). Calyx short, truncate or many-toothed, subtended by 2 bract. 

 lets ; corolla funnel-bell-form, throat inflated, limb 5-cleft, subregular ; 

 stamens 4, didynamous ; anthers cells parallel, ciliate, one of them avvned 

 at base ; capsule globular, 3 to 4-seeded. Shrubs or climbing herbs of 

 the Old World. 



1 T. grandiflora Roxb. Climbing; Ivs. cordate, angled, acuminate, hispid? 

 col. limb truncate, entire. In cultivation, a hardy perennial climber, clothed all 

 over with fine reversed hairs, with large blue flowers 1J' deep and 3' broad, f E. 

 Ind. Variable. 



2 T. alata Bojer. Twining, silky- villous ; Ivs. cordate-sagittate, acute, cm 

 winged petioles; cal 12-cleft, bracteoles repand. In cultivation, perennial, the 

 whole plant soft-villous. Lvs. repand, and 5-veined. Fls. large, yellow, with a 

 purple base, !' deep, campanulate with a curved tube, f E. Africa. Variable. 



2. ELYTRA V RIA, Yahl. (Gr. eAvrpov, an envelope or bract ; from 

 the bracted inflorescence.) Calyx 5 or 4-parted, segments unequal ; 

 corolla bilabiate lower lip or 3 bifid segments ; stamens 2 fertile, 2 

 sterile, included ; anther cells parallel ; capsule 8-seeded from the 

 base, without hoots. -llerbs acaulcscent, with radical Ivs. Scape cov- 

 ered with appressed leaf-like, clasping scales. Fls. email, one beneath 

 each bract of the terminal spike. 



1 E. virgata MX. Scapes several, slender, terete, glabrous, erect, covered with 

 ovate, clasping, cuspidate, alternate scales; Ivs. radical, narrow-oblong, tapering 

 long to the petiole, repand or wavy ; fis. in a dense, imbricated spike, each flower 

 covered by a broadly ovate, coriaceous, cuspidate, ciliate scale ; cal. with 2 linear 

 bractlets which are villous- ciliate as well as the segments ; cor. white, with its 5 

 segm. nearly equal. Wet plains S. Car. to Fla. (Mettauer). Scapes If high. 

 Lvs. 3 to 6' long, 5 to 8" wide. Fls. 4" broad. Summer. (Anonymus Caroli- 

 nensis Walt.) 



3. CALOPH'ANES, Bon. (Gr. KaMg, fair, <j>aiva), to appear.) Calyx 

 segments setaceous, much longer than the tube ; corolla funnel-form, 

 limb subregular, 5-lobed ; stamens 4 ; anther cells spurred or mucron- 

 ate at base, parallel; capsule lanceolate, empty below, 4-seeckd in the 

 middle ; flowers axillary, opposite, mostly solitary, with narrow bracts 

 and bractlets. Low, pubescent herbs with blue corollas spotted in the 

 throat. 



1 C. oblongifolius Don. Densely pubescent, ascending from a procumbent or 

 creeping base ; Ivs. obovate, obtuse, obscurely denticulate, narrowed to the sub- 

 sessile base ; fls. solitary, subsessile, opposite, with oblong bractlets equaling the 

 deeply parted calyx and the corolla tube. If Pine barrens and gravelly plains, 

 Ga. and Fla. common. Herb 6 to 12', branched at base, gimple above. Lvs. 

 1' long, rarely rather acute. Cor. showy, a little- exceeding the Ivs., purplish 

 blue, with deeper purple spots. Apr. (Ruellia oblongifolia MX. Ph.) 



2 C. humistratus Shutt. Smooth, prostrate, diffuse; Ivs. oblong, oval, rather 

 obtuse, entire, narrowed to a petiole; fls. axillary, subsessile, solitary or 2 or 3 

 together; bracts oblong-spatula te, shorter than the strict, setaceous calyx segm. 

 1[ S. Car. to Fla., in rich soils. Lvs. distinctly petiolate. Cal. segm. very slender, 

 scabrous, membranous edged below, 5" long, equaling the 4-seeded capsule. 

 (Ruellia humistrata, MX.) 



4. DIPTERACANTHUS, Nces. (Gr. dfrrrepof, two-winged, a 

 Acanthus.) Calyx deeply 5-cleft ; corolla funnel-form, limb subequally 

 5-lobed ; stamens 4, included ; anther cells parallel, not awned ; cap- 

 sule compressed and empty at base, 2 to IS-seeded above ; seeds orbic- 

 ular, compressed, with hooked, abrupt processes. Mostly herbs with 



