34 NORTH AMERICAN FLORA [VOLUME 32 
hispidulous along the margins and on the nerve above, glabrous beneath, the margins often 
revolute; flowers in dense or lax, more or less leafy cymes, sessile or on long or short, slender or 
stout pedicels; hypanthium at anthesis about 1 mm. long, glabrous or sparsely scaberulous; 
calyx-lobes triangular to oblong, acute, equaling or shorter than the hypanthium, usually 
scaberulo-ciliolate, in fruit equaling or exceeding the capsule but shorter than the hypanthium; 
corolla funnelform, 4-7 mm. long, usually glabrous outside, purplish, the lobes lance-oblong, 
acute or acutish, equaling or shorter than the tube, white-villous within; anthers exserted; 
capsule obovoid-turbinate or oblong, 2.5-3 mm. long, about 2 mm. wide above, almost two 
thirds inferior, broadly rounded or truncate at the apex, often retuse; seeds oval-oblong, 
0.5-0.7 mm. long, concavo-convex, coarsely scrobiculate, black. 
TYPE LOcALITy: Florida. 
DISTRIBUTION: In dry, often sandy soil, Neva? to New Mexico and San Luis Potosi, and east- 
ward to Florida, Tennessee, and southern Michiga 
ILLUSTRATIONS: Britt. & Brown, TSE: 3401; edt 2. 7.3921; A. Heller, Bot. Expl. Tex. pl. 9. 
26. Houstonia tenuifolia Nutt. Gen. 1: 95. 1818. 
Hedyotis longifolia tenuifolia T. & G. Fl. N. Am. 2: 40. soe 
Oldenlandia purpurea tenuifolia A. Gray; Chapm. FI. S. U J.S.181. 1860. 
Houstonia longifolia tenuifolia Wood, Class-Book ed. 1861. 403. 1861. 
Houstonia purpurea tenutfolia A. Gray, Syn. Fl. N. Am. 1?: 26. 1884. 
Erect perennial, rarely decumbent, the stems solitary or numerous, 1.5-6 dm. long, 
usually slender, simple below, branched above, the branches ascending or spreading, obtusely 
angled, glabrous, the internodes often much longer than the leaves; stipules scarious, narrowly 
or broadly triangular, 2.5 mm. long or shorter, acute or cuspidate, usually glandular-dentate 
or laciniate; basal leaves usually wanting at anthesis, earlier forming a rosette, the petioles 
stout, half as long as the blades or shorter, the blades oval to oblong-lanceolate, 1—-2.5 cm. long, 
4-8 mm. wide, rounded to acute at the apex, obtuse or acute at the base, 1-nerved, scaberulous 
or glabrate above, glabrous and often purplish beneath; cauline leaves sessile or nearly so, 
linear or oblong-linear, 1.5—4.5 cm. long, 4.5 mm. wide or narrower, obtuse or acute, glabrous; 
flowers in very lax leafy cymes, the pedicels filiform, mostly 1-2 cm. long; hypanthium glabrous, 
at anthesis less than 1 mm. long; calyx-lobes linear-lanceolate, rarely-ciliolate, about twice as 
long as the hypanthium, the lobes in fruit equaling or slightly exceeding the capsule; corolla 
funnelform, purple, 5—7 mm. long, glabrous outside, the lobes triangular-ovate, obtuse or 
acutish, usually less than half as long as the tube, white-villous within; anthers exserted; 
capsule subglobose, slightly compressed, 2 mm. long, usually distinctly broader than long, 
half inferior, retuse at the apex or rounded, the free portion glabrous; seeds concavo-convex, 
oval, about 0.5 mm. long, peltate, coarsely scrobiculate, black. 
TYPE LocaLity: Near the confluence of Pigeon River and the French Broad, Tennessee. 
DISTRIBUTION: In dry soil, Virginia to Missouri, and southward to Georgia, Texas, and Nuevo 
6n. 
ILLUSTRATIONS: Britt. & Brown, Ill. Fl. f. 3400; ed. 2. f. 3920. 
27. Houstonia purpurea L. Sp. Pl. 105. 1753. 
?Hedyotis umbellata Walt. Fl. Car. 85. 1788. 
Hedyotis caroliniana Raeusch. Nom. ed. 3. 33. 1797. 
Houstonia varians Michx. Fl. Bor. Am. 1: 86. 1803. 
Houstonia pubescens Raf. Med. Repos. II. 5: 361. 1808. 
Knoxia purpurea Lam.; Poir. in Lam. Encye. Suppl. 3: 225. 1813. 
Houstonia latifolia Willd.: 5a. Sap» oystaiver. 32 527.) 1818: 
Anolis purpurea G. Don, ‘Gen. Hist. 3: 535. 1834. 
Hedyotis purpurea T. & G. Fl. N. Am. 2: 40. 1841. 
?Houstonia umbellata Walp. Rep. 1: 496. 1842. 
Oldenlandia purpurea A. Gray, Man. ed. 2. 173. 1856. 
Houstonia purpurea pubescens Britton, Mem. Torrey Club 4: 125. 1894. 
Erect perennial, 2-4 dm. high, the stems solitary or numerous, stout, simple below, 
usually sparsely branched above, the branches ascending, quadrangular, pilose or hirsutulous, 
at least below, often glabrate above, the internodes mostly longer than the leaves; stipules 
scarious, 6 mm. long or shorter, broadly triangular, acute, sometimes cuspidate, entire or laci- 
niate; basal leaves usually wanting at anthesis, on stout petioles half as long as the blades or 
shorter, the blades elliptic or oval, 1.5—2.5 cm. long, 0.5—1 cm. wide, obtuse or acutish at the 
apex and base, hirsutulous or glabrate above, glabrous and often purplish beneath, 1-nerved; 
