26 RUBIACEjE. Houstonia. 



H— -1— -1— Lignescent-rooted perennial, with small and short corolla and naked stipules. 



— H. 'Wrigh.tii, (trat. ^Many-stemmed from a deep root, a span or less high, erect or 

 spreading, glabrous or very obseurc-ly ju-uinose : brandies (juailrangular : leaves thickish, 

 linear or lowest rather lanceolate (half-inch to inch long) : flo\vers in terminal glomerate 

 leafy cymes : c-orolla purplish or neai ly white, between salverforni and funnelform, 2 to 

 hardly 4 lines long, with narrow oblong lobes : capsules on very short recurved peduncles, 

 globose-didymous, about three-fourths free : cells 5-8-seeded : seeds crateriform, with a, 

 small hilar ridge. — Proc. Mw. Acad. xiii. 202. //. hiimifusa. Gray, I'l. ^'i'right. i. 82, & 

 Oldi'iilaiidia hiniiiyiisn, PI. A\'riglit. ii. 68, chiefly, not PI. Lindh. — Hills, S. W. Texas and 

 New Mexico to S. W. Arizona, first coll. by Wriijht. (Adj. Jlex., Parrij ij- Pnliiiir.) 



* * # * Erect perennials : corolla funnelform or in one species ahnostsalverform, small: stamens 

 and summit of style reciprocally exserted quite out of the throat ; fructiferous peduncles erect: 

 capsule from a third to nearly half free: seeds oval nr roundish, barely concave on ventr^d face 

 and with more or less of a medial hilar ridge: stipules entire, scarious, between and connecting 

 the bases of the sessile cauline leaves : tl. mostly in summer. 



^H. purpurea, L. Forming sm;ill tufts or offsets by filiform rootstocks, a span to a foot high, 

 hirsutnlous-pubescent to glabrous: radical leaves ov;rte or oblong, short-petioled : flowers 

 corymboselj' cymose : eor(jll:i funnelform, light purple or lilac, varying to nearly iiliite : 

 capsule globular and obscurely didymous, upper half free. — Spec. i. 105 ; Pnrsh, Fl. i. 107 ; 

 Gray, Man. ed. 5,212. II. varlans, Michx. Fl. i. 86. //. pubescens, Raf. Med. Eep. & Desv. 

 Jour. Bot. i. 230, if of the genus. Olih-nhniilia purpurea, Gr:iy, ilau. ed. 2, 173. Iledi/oiis 

 lanceolata, Poir. Suppl. iii. 14. //. umbellata, Walt. C;ir. 85 '? Anotis lanceolata, DC. Prodr. iv. 

 433. — Canada to Texas. — Truly pol^'morplious, of which the typical form "le:ives ovate- 

 lanceolate," L., or liitifnliii, is comp:iratively large, often a foot high and pubescent : leaves 

 ovate to ovate-lanceolate, inch or two long, the larger with rounded closely sessile base: 

 calyx-lobes subidate, sometimes slightly sometimes conspicuously surpassing the emarginate 

 summit of the c;tpsule. — II. purpurea, Torr. & Gray, Fl. ii. 40. This form from ilaryland to 

 Arkansas, and southward to Alabama, especially in and near the mountains. 



■"^ Var. oiliolata, (;r:iy, Man. 1. c. A span high: lea^■es only half-inch long, thickish; 

 cauline oblong-spatulate ; radical oval or oblong, in rosulate tufts, hirsute-ciliate : calyx-lobes 

 a little longer than the capsule. — II. ci/iolata, Torr. in .Spreng. Syst. Cur. Post. 40, & Fl. i. 

 173. II. loiii/ifbHa, Hook. Bot. Mag. t. 3099, not Giertn. Iledi/olis eiliolatu, Torr. & Ciray, 

 Fl. ii. 40 (exql. .syu. //. serpijUifolia, Graham). — Chiefly northward, on rocky banks along 

 the Great L;ikes and their tributaries, Canada to Michigan and south to Kentucky, jiassiuo- 

 into the next. 



""^ Var. longifolia, Grav, 1. u. A span i>r two high, mostly glabrous, thinner-leaved: 

 leaves oblong-lanceolate to linear (6 to 20 lines long) ; radical oval or oblong, less rosulate, 

 not ciliate: calyx-bjbes little surpassing the capsule. — //. lonr/i folia, GaTttT. Fruct. i. 226, 

 t. 49, f. 8 ; WiUd. >S]iec. i. 583. JInl,j„iis longifolia, Hook. Fl.' i. 286 ; Torr. & (h-ay. 1. c! 

 II. cnvjustifolia, Pursh, Fl. i. 106, partly, — Rock) or gravelly grouud, Can;ula to Saskatche- 

 wan, Jlissouri, and Georgia. 



■"=» Var. tenuifolia. Slender, lax, diffuse, 6 to 12 inches high, with loose inflorescence, 

 almost filiform branches and peduncles : cauline leaves all line;ir, hardlv over a line A\idc ' 

 otherwise as preceding. — //. termlfoUa, Kutt. Gen. i. 95. Ih-dyotis longifolia, v:xr. tenuifolia, 

 Torr. & Gray, 1, e. — S. E. Ohio, and through the mountains, Virginia to X. Carolina and 

 Tennessee. 

 """ Var. calycosa. Near a foot high: leaves broadlv lancolate, thickish: calyx-lobes 

 elongated (2 to 4 lines long), much sur]i:rssing the ca,psule'. — //,-,/y,rf^^■ ,■«/,/,■,«„, Sliuttlew. in 

 distrib. PI. Rugel, — Mountains o[ Alabam:i (Hmjd) to -Vrkans:is (.V««a;/),' and Illinois 

 (E. Hall); also coll. by I innnmnnd. 



-H. angustifolia, Mionx. Rather rigid, becoming many-stemmeil from a perpendicular 

 rout, glabrous : leaves narrowly linear or lowest somewhat 'spatulate, ou the stems commonly 

 fascicled in the axils : flowers cnrymbosely or panicuhiteh- cvmose, short-iiediccUed or sub- 

 sessile : corolla nearly salverform, 2. or 3 lines long, niostlv white, upper face of the lobes 

 c.niimoiily villons-iiubescent: capsule with turbinate or acutish base, ,.iilv the summit free 

 and biirely eipiaUed by the short calyx-teeth, fir.st o]u.iiing across the ti]., at length septi- 

 cidal: seeds obscurity concave ou the hilar face. (Triiiis'ltion to Oldenlavdia.) — Fl. i 85 ■ 

 Gray, 1.0. ILfrutKv.'ia& /I. rupestris, \Ut //«/,/„/,.« ,sYc«oy,/, ,///„, Torr. & Gray I.e. Olden- 



