108 ACANTHACEAK. 



Stems, and branches, clothed with sheathing scales. 1. Tt BIFLOBA. 



Stems, and branches, not clothed with scales. 

 Corolla convolute In the bud. 



Calyx-lobes bristle-like : anther-sacs armed or pointed at 



the base. _ I>VSCHORISTB. 



Calyx-lobes linear to lanceolate : anther-sacs pointless. KU.IA. 



Corolla Imbricate in the bud. 



Stamens 4 : anthers 1 -celled. 4. GEIUBDIA. 



Stamens 2 : anthers 2-celled. 5. DIANTHEBA. 



1. TUBIFLORA J. F. Gmel. Rigid herbs. Flowers in terminal 

 Calyx-lotos 4 or 5, the lateral ones the narrower. Corolla white or blue, 

 slightly 2-lipped. 



1. T. angustifolia (Fernald) Small. Stems 2-6 ,1m. tall: basal leaves 4-31 

 cm. long; blades linear, elongate linear-spatulate or narrowly oblanceolate : 

 bracts acuminate: corolla-lobes much shorter than the tube: capsules about 

 5 mm. long. Everglades and low pinelands. 



2. DYSCHOEISTE Nees. Herbs or woody plants: leaf -blades entire. 

 Flowers solitary or clustered in the axils. Calyx-lobes 5, very slender. Corolla 

 blue, purple, or rarely white, slightly 2-lipped. Capsules 2-4-seeded. [Cain- 

 phones D. Don.] 



1. D. angusta (A. Gray) Small. Stems 1-2 dm. tall: leaves numerous; blades 

 1-2.5 cm. long, spatulate below to linear-oblong or linear above: calyx-lobes 

 linear-subulate, 9-11 mm. long: corolla-limb about 10 mm. wide: capsules 7-8 

 mm. long. [C. angusta A. Gray.] Pinelands. K. K. 



3. RUELLIA [Plum.] L. Caulescent herbs. Leaf -blades entire or 

 toothed. Flowers axillary or sometimes in terminal clusters. Calyx 5-lot>ed, 

 the lobes narrow. Corolla nearly regular. Capsules 6-20 see<l'<l. 



Plants diffuse, with decumbent stems and branches: calyx-lobes bristly pubescent 



and clllnte. 1 /.'. /./,, i,/.i. 



Plants erect, with erect vlrgate branches: calyx-lobes glabrous 



or with remote cilia. 2. R. nucculcnta, 



1. B. hybrid* Pursh. Stems 2-6 dm. lon^j. often .liffusely spreading. 



cent, but green: leaf-blades oblong to oblong-lanceolate, 3-1 o cm. long: 

 calyx hirsute; lobes linear-filiform, 15-20 mm. long: corolla light-blue, 4-5 cm. 

 long. Pinelands. F. K. 



2. E. succulent* Small. Stems 1.5-5 dm. tall, inconspicuously puberuh-nt : 

 leaf-blades narrowly oblong to spatulate, 2.5-4.5 cm. long: calyx sparingly 

 ciliate or glabrous; lobes linear-filiform, 13-16 mm. long: corolla deep pur- 

 plish-blue, about 4 cm. long. Everglades. 



4. OEBABDIA L. Mostly scapose herbs. Leaves mainly banal. Flowers 

 in terminal spikes. Calyx-lobes 5, nearly equal. Corolla with slightly unequal 

 broad spreading lobes. [Stcnandrium Nees.] 



1. 0. florldana (A. Gray) Small. Plants 2-6 cm. tall: leaf-blades ovate to 

 oblong or oval, 2-3 cm. long: calyx-lobes linear-subulate, becoming 9-11 nun. 

 long: corolla rose- purple, 16-20 mm. long: capsules 9-12 mm. long. [5. 

 floridanum (A. Gray) Small.] Pinelands. 



5. DIANTHEBA [Gronov.] L. Caulescent herbs. Leaf-blades entire or 

 rarely toothed. Flowers on axillary peduncles. Calyx-lobes 4 or 5, narrow or 

 slender. Corolla strongly 2-lipped: upper lip entire or 2-lobed; lower lip 

 3-lobed. 



1. D. crassifolia Chapm. Stems 2-4 dm. tall: leaf-blades linear, usually nar- 

 rowly so, or spatulate near the base of the stem, 3-15 cm. long, fleshy: calyx- 



