400 ACAtfTfiACE,E. (ACANTHUS FAMILY.) 



supported by hooked projections of the placentae (retinacula). Flowers 

 commonly much brae ted. Calyx 5-cleft. Style thread-form ; stigma 

 simple or 2-cleft. Pod loculicidal, usually flattened contrary to the valves 

 and partition. Cotyledons broad and flat. Mucilaginous and slightly 

 bitter, not noxious. A large family in the warmer parts of the world ; 

 represented in gardens by THUNBERGIA, which differs from the rest by 

 the globular pod and seeds, the latter not on hooks. 



* Corolla not obviously bilabiate, the 5 lobes broad and roundish, spreading ; stamens 4. 



1. Calophanes. Calyx-lobes long-filiform. Capsule 2 -4-seeded. 



2. Kuellia. Calyx-lobes mostly linear or lanceolate. Capsule 6- 20-seeded. 



* * Corolla bilabiate, upper lip erect and concave, lower spreading ; stamens 2. 

 8. Dianthera. Capsule obovate, flattened, 4-seeded. 



1. CALOPHANES, Don. 



Calyx deeply 5-cleft or parted ; its lobes elongated setaceous-acuminate or 

 aristif orm. Corolla funnel-form, with ample limb, convolute in the bud. Sta- 

 mens 4, the anthers mucronate or sometimes aristate at base. Ovules a single 

 pair in each cell. Capsule oblong-linear, 2 - 4-seeded. Low branching per- 

 ennials, pubescent or hirsute, with proportionally large axillary nearly sessile 

 flowers (solitary or few), and blue corolla. (Name from Ka\6s, beautiful, aud 

 (fratw, to appear.) 



1. C. Oblongifdlia, Don. Stems usually erect and simple, - 1 high; 

 leaves from narrowly oblong to oval, very obtuse, sessile (!' long or less) ; co- 

 rolla blue, sometimes purple-dotted or mottled, seldom 1'long; calyx-lobes 

 nearly distinct, filiform-setaceous, hirsute. Pine-barrens, S. Va. to Fla. 



2. RUE L LI A, Plumier. 



Calyx 5-parted. Corolla funnel-form, with spreading ample border, convo- 

 lute in the bud. Stamens 4, the cells of the somewhat arrow-shaped anthers 

 parallel and nearly equal. Capsule narrow, in our species somewhat flattened, 

 contracted and seedless at the base, above 8- 12-seeded. Seeds with a muci- 

 laginous coat, when wet exhibiting under the microscope innumerable taper- 

 ing short bristles, their walls marked with rings or spirals. Perennials, with 

 rather large and showy blue or purple flowers, mostly in axillary clusters, 

 sometimes also with small flowers precociously close-fertilized in the bud. Ca- 

 lyx often 2-bracteolate. (Named for the early herbalist, John Ruelle.) 



1. B. Cili6sa, Pursh. Hirsute with soft whitish hairs (1 -3 high) ; leaves 

 'nearly sessile, oval or ovate-oblong ( 1 - 2' long) ; flowers 1-3 and almost sessile 

 in the axils; tube of the corolla (1 - 1^' long) fully twice the length of the seta- 

 ceous calyx-lobes ; the throat short. Dry ground, Mich, to Minn., south to 

 Fla. and La. June -Sept. Var. AMBfouA, Gray. Sparingly hirsute-pubes- 

 cent or glabrate ; leaves ovate-oblong, usually short-petioled, larger ; tube of 

 corolla little exceeding the hardly hirsute calyx. Va. and Ky. to Ala. Ap- 

 pearing like a hybrid with the next. 



2. R. strdpens, L. Glabrous or sparingly pubescent (1 -4 high) ; have* 

 narrowed at base into a petiole, ovate, obovate, or mostly oblong (2- 5" long), 

 tube of the corolla (about Y long) little longer than the dilated portion, slightly 



