26 EUBIACE^. Houstonia. 



•1— -1— -t— Ligiiescent-rooted perennial, with small and short corolla and naked stipules. 



H. "W^rig'htii, Gray. Mauy-stenimed from a deep root, a span or less high, erect or 

 spreading, glabrous or very obscurely pruiuose : branches quadrangular : leaves thickish, 

 linear or lowest rather lanceolate (half-iuch to inch long) : Howers in terminal glomerate 

 leafy cymes : corolla purplish or nearly white, between salverform and funiielform, 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. Am. Acad. xvii. 202. //. hiimifiisu, Gray, PL Wright, i. 82, & 

 Okkii/aiidia luunlfttsa, PI. Wright, ii. 68, chiefly, not PL Liudh. — Hills, S. W. Texas and 

 New Mexico to S. W. Arizona, first coll. by Wr'Kjld. (Adj. Mex., Parry Sf Palmer.) 



* * * * Ei-ect perennials : corolla funnelform or in one species almost salverform, 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 or roundish, barely concave on ventriil face 

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

 the bases of the sessile cauliue leaves : fi. mostly in summer. 



H. purpurea, L. Forming small tufts or offsets by filiform rootstocks, a spau to a foot high, 

 hirsutulous-pubesceut to glabrous: radical leaves ovate or oblong, short-petioled : flowers 

 corymbosely cymose : corolla funueKorm, light purple or lilac, varying to nearly white : 

 capsule glol)ular and obscurely didymous, upper half free. — Spec. i. 105 ; Pursh, Fl. i. 107 ; 

 Gray, Man. ed. 5,212. H. varians, Michx. Fl. i. 86. U. pubescens, Raf. Med. Rep. & Desv. 

 Jour. Bot. i. 230, if of the genus. Oldeiilandia purpurea, Gray, Mau. ed. 2, 173. lledyo'ls 

 lanceolata, Poir. Suppl. iii. 14. //. innheUata, Walt. Car. 85 ? Anotis lanceoluta, DC. Prodr. iv. 

 433. — Canada to Texas. — Truly polymorphous, of which the typical form " leaves ovate- 

 lanceolate," L., or lutlfolla, is comparatively 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 subulate, sometimes slightly sometimes conspicuously surpassing the emarginate 

 summit of the capsule. — //. purpurea, Torr. & Gray, Fl. ii, 40. This form from Maryland to 

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



Var. ciliolata, Gray, Man. 1. c. A span high : leaves only half-inch long, thickish ; 

 cauliue oblong-spatulate ; radical oval or oblong, iu rosulate tufts, hirsute-ciliate : calyx-lobes 

 a little longer than the capsule. — H. ciliolata, Torr. in Spreng. Syst. Cur. Post. 40, & FL i. 

 173. II. loiir/i folia, Hook. Bot. Mag. t. 3099, not Gairtn. Iledyotis ciliolatci, Torr. & Gray, 

 FL ii. 40 (excl. syn. //. serpyUifolia, Graham). — Chiefly northward, on rocky banks along 

 the Great Lakes aud their tributaries, Canada to Michigan and south to Kentucky, passing 

 into the next. 



Var. longifolia, Gray, 1. c. A span or two high, moL^tly glabrous, thinuer-leaved : 

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

 not ciliate : calyx-lobes little surpassing the capsule. — //. loiujifolia, Ga;rtu. Fruct. i. 226, 

 t. 49, f. 8 ; Wilid. Spec. i. 583. Iledyotis longifolia, Hook. Fl. i. 286 ; Torr. & Gray, 1. c. 

 II. angusti folia, Pursh, Fl. i. 106, partly. — Rocky or gravelly ground, Canada to Saskatche- 

 wan, Missouri, and Georgia. 



Var. tenuifolia. Slender, lax, diffuse, 6 to 12 inches liigh, with loose inflorescence, 

 almost filiform branches and peduncles : cauliue leaves all linear, hardly over a line wide : 

 otherwise as preceding. — //. tenuifolia, Nutt. Gen. i. 95. Iledyotis longifolia, var. tenuifolia, 

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

 Tennessee. 



Var. calycosa. Near a foot high : leaves broadly lanceolate, thickish : calyx-lobes 

 elongated (2 to 4 lines long), much surpassing the capsule. — Iledyotis calyru.ta, Shuttlew. in 

 distrib. PL Rugel. — Mountains of Alabama {Rugel) to Arkansas (Xuttall), and Illinois 

 {E. Hall) ; also coll. by Drummond. 



H. angustifolia, Michx. Rather rigid, becoming many-stemmed from a perpendicular 

 root, glal)rous : leaves narrowly linear or lowest somewhat spatulate, on the stems commonly 

 fascicled in tlie axils : flowers corymbosely or paniculately cymose, short-pedicelled or sub- 

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

 commonly villous-pubescent : capsule with turl)inate or acutish base, only the summit free, 

 and barely ei[ualled by the short calyx-teeth, first opening across the tip, at length septi- 

 cidal : seeds obscurely concave on the hilar face. (Transition to Oldenlandia.) — Fl. i. 85; 

 Gray, 1. c. Il.fruticona & //. rupestris, Raf. Iledyotis stenophylla, Torr. & Gray, 1. c. Olden- 



