258 Engelmann and Gray, 



— Low woods between the Brazos and the Colorado : June — 

 Sept. Also collected by Drummond (Coll. II. No. 202.) 

 (In similar situations, near St. Louis, Engelmann, and Ala- 

 bama, Buckley.) — Plant 1 to 3 feet high, with much the 

 aspect of D. strepens in fruit, except that the leaves are nar- 

 rower (the lower cauline barely ovate-oblong,) or of D. hybri- 

 dus (but nearly glabrous,) but remarkable for its quite 

 inconspicuous flowers. Corolla only about four lines long, 

 whitish, the limb perhaps very rarely expanding, 5-toothed. 

 Filaments conspicuously connate by pairs at the base in a 

 ligula : anthers muticous. Style somewhat hairy : one of the 

 lobes of the stigma abortive, the remaining one subulate. 

 Capsule and seeds as in D. strepens, &C. 1 



291. Dianthera Americana, Linn. Creeks of the Colo- 

 rado ; July — Aug. — Seeds destitute of the mucilaginous 

 coating, and appressed hairs of Dipteracanthus, &c. 



1 There are two other well-marked new species of Dipteracanthus (Ruellia) in 

 Drummond's Texan Collection, viz. 



D. Dkummondii (Torr. <$• Gr. MSS.) : cinereo-pubescens et pilis mollibus hir- 

 suta ; caulihus e basi ramosis adscendentibus ; foliis oblongo-lanceolatis obtusiusculis 

 saepe repandis arete sessilibus ; floribus in axillis subsolitariis breviter pedunculatis 

 vel subsessilibus ; bracteis lanceolatis ; calycis laciniis filiformibus hirtis tubo corol- 

 las infundibuliformis multum brevioribus capsulam clavato-ovoideam 4-spermam ex- 

 cedentibus. — Stems 6 to 20 inches high. Leaves li-2 inches long, somewhat erect, 

 about the length of the internodes, or the upper more approximate usually very obtuse 

 at the base. Corolla 2\ inches long, the slender tube finely infundibuliform at the 

 summit. Anthers muticous. — Var. a. Tex. Drum. Coll. II. No. 220, and III. No. 

 258. /?. Very hirsute and more branched. Coll. II. No. 219. 



D. (Calophanes) linearis {Torr. $• Gr. MSS.) : humilis, subpubescens ; cau- 

 libus e basi lignosa ramosissiniis diffusis ; foliis lineari-oblanceolatis integriusculis 

 obtusis basi attenuatis subsessilibus ; floribus solitariis geminisve in axillis subses- 

 silibus ; bracteis foliis conformibus calycem subsequautibus ; calycis laciniis hirtis 

 subulato-setaceis tubum corolla paulo exeedentibus capsulam oblongam tetragonam 

 demum quadrivalvem 2-4-spermam superantibus. — Texas, Drummond's Coll. II. 

 No. 178. Also near Columbus, Dr. Wright. Stems or branches a span long. 

 Leaves an inch in length. Corolla about as large as in D. {Calophanes) bijlora or 

 oblongifolia ; the tube short, and the limb somewhat bilabiate. The sepals, as in 

 the above-mentioned species, united below into a short tube. Anthers subsagittate, 

 the cells distinctly cuspidate at the base. Stigma single. Capsule somewhat fusi- 

 form ; the valves each separating into two through the complete dissepiment. The 

 hairs of the seed are very slender, and marked with extremely delicate rings. — We 

 have not the fruit of the allied D. bijlora (Ruellia oblongifolia, Michx.) Perhaps 

 the genus Calophanes might be kept apart from Dipteracanthus, if, indeed, either 

 be sufficiently distinct from Ruellia proper. A. Gr. 



