834 Order 87.— ACANTHACB^. 



1. THUNBER'GIA, L. (In bono* of C. P. Thunberg, 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, eiliate, one of them awncd 

 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 ; 

 oal. limb truncate, entire. — ^lu cultivation, a liardy perennial climber, clothed all 

 over with fine reversed hairs, with largo blue flowers 1 J' deep and 3' broad. \ K 

 Ind. Variable. 



2 T. alata Bojer. Twining, silky- villous ; lv3. cordate-sagittate, acute, on 

 winged petioles; ccd. \2-cleft, bracteoles repand. — In cultivation, perennial, the 

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

 purple base, 1^' deep, campanulate with a curved tube. \ E. Africa. Variable. 



2. ELYTRA^RIA, Vahl. (Gr. eXvrpov, an envelope or bract; from 

 the bractcd 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. — Herbs acaulescent, with radical lvs. Scape cov- 

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

 each bract of the terminal spike. 



1 E. virgata Mx. Scapes several, slender, terete, glabrous, erect, covered ^^^th 

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

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

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

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

 scgm. nearly equal. — Vfet plains S. Car. to Fla. (Mettauer). Scapes If high. 

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

 nensis Walt.) 



3. CALOPH'AKES, Don. (Gr. KaXog, fair, (paivu, to appear.) Calyx 

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

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

 atc at base, parallel ; capsule lanceolate, empty below, 4-socdcd in the 

 middle ; flowers axillary,oi3posite, mostly solitary, with nairow bracts 

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

 throat. 



1 C. oblongifolius Don. Densely pubescent, ascending fi-om a procumbent or 

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

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

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

 Ga. and Pla. common. Herb 6 to 12', branched at base, simple above. Lvs. 

 1' long, rarely rather acute. Cor. showy, a Mttio exceeding the lvs., purphsh 

 blue, with deeper purple spots. Apr. (Ruellia oblongifoMa Mx. Ph.) 



2 C. humistratua Shutt. Smooth, prostrate, diflfuse; lvs. oblong, oval, rather 

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

 together ; bracts oblong-spatulate, shorter than the strict, setaceous calyx segm. — 

 y S. Car. to Pla., 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. DIPTERACAN'THUS, Nees. (Gr. Si-nrepog, two-winged, anaveoc. 

 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 12-seed6d above ; seeds orbic- 

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



