26 RUBIACE.E. Houstonia. 



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

 H. Wrightii, Gray. Many-stemmed from a deep root, a span or less high, erect or 

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

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

 leafy cymes : corolla purplish or nearly white, between salverform 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. Am. Acad. xvii. 202. H. humifusa, Gray, PI. Wright, i. 82, & 

 Oldenlandia humifusa, PI. Wright, ii. 68, chiefly, not PI. Lindh. — Hills, S. W. Texas and 

 New Mexico to S. W. Arizona, first coll. by Wright. (Adj. Mex., Parry 8f Palmer.) 



# # # # Erect 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 ventral face 

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

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



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

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

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

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

 Gray, Man. ed. 5, 212. H. varians, Michx. PI. i. 86. H. pubescens, Baf. Med. Eep. & Desv. 

 Jour. Bot. i. 230, if of the genus. Oldenlandia purpurea, Gray, Man. ed. 2, 173. Hedyotis 

 lanceolata, Poir. Suppl. iii. 14. H. umbellata, Walt. Car. 85 % Anotis lanceolata, DC. Prodr. iv. 

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

 lanceolate," L., or latifolia, 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 emargiuate 

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

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



Var. ciliolata, Gray, Man. 1. c. A span high : leaves 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. — H. ciliolata, Torr. in Spreng. Syst. Cur. Post. 40, & Fl. i. 

 173. H. hngifolia, Hook. Bot. Mag. t. 3099, not Gsertn. Hedyotis ciliolata, Torr. & Gray, 

 Fl. ii. 40 (excl. syn. H. serpyllifolin, Graham). — Chiefly northward, on rocky banks along 

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

 into the next. 



Var. longifolia, Ghat, 1. c. A span or 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-lobes little surpassing the capsule. — H. longifolia, Gasrtn. Fruct. i. 226, 

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

 H. angustifolia, Pursh, Fl. i. 106, partly. — Bocky or gravelly ground, Canada to Saskatche- 

 wan, Missouri, and Georgia. 



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

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

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

 Torr. & Gray, 1. c. — S. E. Ohio, and through the mountains, Virginia to N. 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. — Hedyotis calycosa, Shuttlew. in 

 distrib. PI. Rugel. — Mountains of Alabama (Rugel) to Arkansas (Nuttall), and Illinois 

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

 H. angustifolia, Micnx. Bather rigid, becoming many-stemmed from a perpendicular 

 root, glabrous : leaves narrowly linear or lowest somewhat spatulate, on the stems commonly 

 fascicled in the 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 turbinate or acutish base, only the summit free, 

 and barely equalled 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, I.e. H. fruticosa & H. rupestris,"Rai. Hedyotis stenophjlla, Torr. &Gray, I.e. Olden- 



