234 ORDER 89. ACANTHACE^E. 



Caps, narrow. Seeds 4 16, resting on hooks, it Low, with tumid joint.^ 



opposite leaves, and showy axillary blue, purple, or white flowers. 



DIPTERACANTHUS. Anthers pointless. Style bifid. S^ods & 12 Nos. 1-8 



CAL6PHANES. Anthers pointed at base. Style simple, s, Jg 4. South... (a) 



a Stems erect from a creeping base, with obtuse 1- - Nos. 4, 5 



a Stems creeping, diffuse, with the leaves entire Nos. 6, 7 



t R. strepeiis L. Erect, smoothish, with obovatc to oblong- peiio.'atr 'v-- ; ->rd. very 

 short, 1^1-flowered ; bractlets as long as the narrow sepals, little- < noire, -m the 

 slender corolla tube. Dry soils, W. and S. 916'. Leaves 2 5'. June, .!..>. 



2 R. clllosa Ph. Erect, white-hairy, with Ivs. obovate to oblong, abrupt at base and 

 f-ubsessile ; bractlets and eepals not half as long as the tube of the corolla. Rich 

 soils. W. and S. If or more. Leaves 1 2'. Flowers 2 2'- June September. 

 ft. lif/hriilii*. Low, decumbent, and very hairy. Georgia (Dr. Feay). 



S R. tubiflora Lc Conte. Downy ; leaves oblong to lanceolate, sessile ; fls. solitary ; 

 sep. lance-linear, f as long as the long tube of the white cor. Ga., Fla. June Aug. 



4 R. ofoloiigifolla MX. Very downy ; Ivs. obovate to oval, subsessile ; fls. 13 to- 



gether, bractlets and sepals as long as tube of the spotted corolla. Dry, Ga., Fla. 



5 R. riparia (Chapm.) Smoothish, simple ; Ivs. oblong, petiolate ; flowers clustered, 



small (6"), white, bractlets, sepals, and corolla tube equal. Mid. Fla. 1218'. 



6 R. liumistrata MX. Smooth ; Ivs. oblong-oval, petiolate ; flowers 13 together, 



bractlets shorter than the setaceous sepals. Rich soils, S. Car. to Fla. 



7 R. linearls T. & G. Small, rough-downy ; leaves linear-oblong, imbricated, tho 



bractlets similar ; capsule 4-angled, with 2 1 seeds. S. Fla. 



4. HYGROPHILA, R. Br. Calyx half-o-cleft, with narrow segments 

 Cor. ringent, lower lip trifid. Sta. 4, unequal, cells of the antli. divergent- 

 sagittate, violet. Stig. subulate. Caps, terete, oo-seeded. it ? Stolonif- 

 erous, 4-angled. Flowers clustered in the axils. (See Addenda.) 



II. lacustris Necs. Erect, simple, smooth ; leaves lance-oblong, sessile (3 4'); fl>. 

 sessile, appearing whorled, white. Borders of lakes. New Orleans. 1 2,f. 



5. DICLIPTERA, Juss. Fls. in bracted heads. Cal. 5-parted. Cor. 

 bilabiate, inverted, upper lip 8-toothed, sta. 2, antli. cells equal, one placed 

 above the other. Caps. 4-seeded, the partitions and valves separating, it 



1 I>. bracliiata Spr. Smooth ; st. G-angled, brachiatcly branched ; leaves lanceo- 



late, long-petiolate, acuminate ; heads few-flowered, the upper approximate, sessile, 

 lower often pedunculate ; flowers purple, 5 G". River banks, S. 1 2f. June Aug. 



2 D. Halei Riddell. St. downy, mostly simple; leaves lance-ovate, petiolate; bract- 



lets and sepals fringed with long hairs ; corolla 5" long. Fla. to La. 1 2f. Jn. Aug. 



3 D. assurgeiis Juss., with scarlet (!') corollas in 1-sided spikes, grows in S. Fla. 



6. DIANTHERA. Gron. (Khytiglossa, Nees, and C-B.) Cal. 5-parted. 

 Cor. bilabiate, upper lip notched, lower 3-lobccl. Stamens 2, antli. cells un- 

 equal, one placed above the other. Capsule flattened, 4-seeded above the 

 middle. U X? Lvs. smooth, entire. Flowers in bracted spikes or heads. 



1 I). Americana L. Erect, angular, tall ; leaves long-lanceolate, wavy, as long 



(3 4'} as the peduncles ; bracts and sepals lanceolate. 3", the ringent corolla G", 

 violet-purple. Banks, N. Y., W. and S. 2 3f. June. July. 



2 D. eiisiformts Wood. Erect from a creeping base, slender; leaves linear, oblique 



or ensiform, thick, shorter ('J 4') than the peduncles ; flower? spicatc ; calyx G" : co- 

 rolla purple.!'. Fla. April. (D. crassifolia Chapm.) 



