234 ORDEK 89. ACANTHACE^E. 



Caps, narrow. Seeds 4 16, resting on hooks. U Low, with tumid joints, 

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



DIPTERACANTHUS. Anthers pointless. Style bifid. Seeds & 12 NOB. 1- ? 



CAI^PHANES. Anthers pointed at base. Style simple. Seeds 4. South... (a) 



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



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



1 R. strepens L. Erect, smoothish, with obovate to oblong-petiolate Ivs. ; ped. very 



short, 1^4-flowered ; bractlets as long as the narrow sepals, little shorter than the 

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



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



subsessile ; bractlets and sepals not half as long as the tube of the corolla. Rich 

 soils. W. and S. If or more. Leaves 1 2'. Flowers 2 24-'. June September. 



/3. hf/briilus. Low, decumbent, and very hair}'. Georgia (Dr. Feay). 

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

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



4 R. oblongifolia 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 (6'0, white, bractlets, sepals, and corolla tube equal. Mid. Fla. 1218'. 



6 R. liuinistrata MX. Smooth; Ivs. oblong-oval, petiolate; flowers 1 3 together, 



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



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



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



4. HTGROPHILA, R. Br. Calyx half-5-cleft, with narrow segments 

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

 sagittate, violet Stig. subulate. Caps, terete, co-seeded. U x? Stolonif- 

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



H. laeustris Nees. Erect, simple, smooth ; leaves lance-oblong, sessile (34'); fls. 

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



5. DIOLIPTERA, Juss. Fls. in bracted heads. Cal. 5-parteil. Cor. 

 bilabiate, inverted, upper lip 3-toothed, sta. 2, anth. cells equal, one placed 

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



1 D. bracliiata Spr. Smooth ; st. 6-angled, brachiately branched ; leaves lanceo- 



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

 lower often pedunculate ; flowers purple, 5 6". River banks, S. 1 2f. June Aug. 



2 I>. Halel 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. ass argons Juss., with scarlet (!') corollas in 3-sided spikes, grows in S. Fla. 



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

 Cor. bilabiate, upper lip notched, lower 3-lobed. Stamens 2, anth. cells un- 

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

 middle, if 7 Lvs. smooth, entire. Flowers in bracted spikes or heads. 



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

 (340 as the peduncles; bracts and sepals lanceolate, 3", the ringent corolla 6", 

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



J D. ensiformis Wood. Erect from a creeping base, slender ; leaves linear, oblique 

 or ensiform, thick, shorter (3 4') than the peduncles ; flowers spicate ; calyx 6" : co- 

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



