534 ORDER 87. ACANTHACE^E. 



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

 TJpsal). 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 ; 

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

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

 Ind. Variable. 



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

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

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

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



2. ELYTRA'RIA, Vahl. (Gr. ehvrpov, an envelope or bract; from 

 the bracted inflorescefice.) 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 Ivs. 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 with 

 ovate, clasping, cuspidate, alternate scales- Ivs. 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, 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. naXo^ fair, 0a/va>, to appear.) Calyx 

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

 limb subregulav, 5-1 obed ; stamens 4 ; anther cells spurred or mucron- 

 ate at base, parallel ; capsule lanceolate, empty below, 4-seeded 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 Pino barrens and gravelly plains, 

 Ga. and Fla. common. Herb 6 to 12', branched at base, simple 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; brafts oblong-spatulate, shorter than the strict, setaceous calyx segm. 

 2f 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, Nees. (Gr. dim-epos, two-winged, aar0oc, 

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

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

 sule compressed and empty at base, 2 to 12-seeded above ; seeds orbic- 

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



