1108 RUBIACEAE 
as the sepals or slightly longer; lobes oblong or elliptic, as long as the tube or longer : 
capsules 3-4 mm. broad. 
On dry hillsides, Missouri to Arkansas and Texas. Spring. 
5. Houstonia subviscósa (C. Wright) A. Gray. Annual, finely glandular-pubes- 
cent. Stems simple or usually branched at the base, the branches erect or ascending, 5-15 
em. long, commonly forking : leaf-blades narrowly linear or some of the basal ones linear- 
spatulate, 1-3 cm. long, acute: peduncles from the first fork and at the succeeding nodes, 
shorter than the subtending leaves, spreading, or at maturity reflexed : hypanthium glan- 
dular, becoming 2 mm. high: sepals linear, longer than the hypanthium : corolla white, 
about 2.5-3.5 mm. long: capsules didymous, 3-3.5 mm. broad. 
On plains or prairies, Texas. Spring and summer. 
6. Houstonia humifüsa A. Gray. Annual, depressed, glandular-puberulent. 
Stems much branched, the branches finally forking and forming dense tufts: leaf-blades 
linear or linear-spatulate, 0.5-2 cm. long, cuspidate, somewhat fleshy : flowers peduncled : 
peduncles in all the forks and all the nodes, several mm. long, finally recurved : hypan- 
thium minutely glandular, flat, barely 1 mm. long at maturity : sepals setaceous-subulate, 
several times longer than the hypanthium: corolla pale purple or whitish ; tube open- 
funnelform, about 6 mm. long ; lobes oblong, puberulent within: capsules didymous, 
plump, 2.5-3 mm. broad. 
On sandy or gravelly hills, Texas. Spring. 
7. Houstonia Cróftiae Britt. & Rusby. Annual, depressed, very sparingly pubes- 
cent. Stems branched at the base, the branches spreading, 1-2.5 em. long, simple or fork- 
ing: leaf-blades spatulate-oblanceolate, 5-10 mm. long, obtuse, revolute, tapering into 
short petioles: flowers sessile: hypanthium becoming about 1 mm. high, flattish : sepals 
triangular or triangular-lanceolate, acute: corolla white, about 3 mm. long ; tube funnel- 
form, thrice as long as the sepals ; lobes oblong-ovate or ovate-lanceolate : capsules didy- 
mous, 2 mm. broad, pubescent. 
In dry soil, Texas. Spring. 
8. Houstonia rotundifdlia Michx. Perennial, hispidulous or glabrate. Stems 
prostrate, usually creeping, 5-40 em. long, more or less branched : leaf-blades somewhat 
fleshy, oval to suborbicular, 5-18 mm. long, obtuse or acutish, ciliate, narrowed into short 
petioles : pedicels 5-11 mm. long: hypanthium becoming 1-1.5 mm. high : sepals oblong, 
obtuse: corolla white, about 1 em. long; tube slender; lobes oval to ovate, obtuse or 
acutish, shorter than the tube : cleistogamous flowers numerous, with well developed but 
closed corollas : capsules didymous, 3-4 mm. broad. 
In low sandy soil, South Carolina to Florida and Louisiana. Spring to fall. 
9. Houstonia lanceolata (Poir.) Britton. Perennial, sparingly rough-pubescent. 
Stems more or less densely tufted, erect or ascending, 1-3 dm. tall, commonly pega 
above, pubescent in the angles especially near the nodes: leaves thickish ; basal wit 
oblong or spatulate blades and ciliate petioles ; cauline sessile, lanceolate to oblong-lanceo- 
late, ciliate, acute: pedicels 3-10 mm. long: hypanthium becoming 1.5-2 mm. Ee 
sepals linear, 4-8 mm. long, the tips becoming recurved : corolla lilac or bluish, about 
mm. long; lobes ovate or nearly so: capsules subglobose, 3-3.5 mm. in diameter. 
In woods, Illinois to Tennessee, Alabama and Arkansas. Spring. 
10. Houstonía purpürea L. Perennial, glabrous or somewhat pubescent. a 
tufted, 0.5—4 dm. tall, simple or sparingly branched : leaf-blades ovate to branit P 
late, or the lower ones oval, oblong or spatulate-ovate, obtuse or acute, ciliate, 1 3 des 
long, the upper one sessile, the lower, or basal ones petioled : pedicels slender, i. 9-3 
long: hypanthium becoming 1.5-2 mm. high: sepals subulate or linear-lanceola KA z 
mm. long, about as long as the hypanthium at maturity: corolla lilac, light P Ry 
white, 6-7 mm. long; lobes ovate or oblong-lanceolate : capsules subglobose, obsc 
didymous, 2-2.5 mm. in diameter. i 
In moist or dry soil, especially on or near the mountains, Maryland to Kentucky, 
Georgia and Alabama. Spring to fall. d en 
11. Houstonia ciliolata Torr. Perennial, deep green. Stems usually veis "blades 
or ascending, 0.5-2 dm. tall, mostly branched : leaves mainly basal, 1-3 em. pred ferri 
oblong or elliptic to spatulate, obtuse or acutish, ciliate, short-petioled or aie qe 
sessile: pedicels 1-5 mm. long: hypanthium usually sparingly pubescent, —— Ns 
high: sepals oblong or oblong-lanceolate, 2-3 mm. long, rather foliaceous: Co aperui: 
7-9 mm. long ; tube funnelform ; lobes oblong-lanceolate, about twice as long as 
capstiles subglobose, nearly 3 mm. long, about 3 free. 
In rocky soil or open woods, Maine to Ontario, Michigan, Pennsylvani 
and summer. . 
Arkansas, 
a and Arkansas. Spring 
