150 RUBIACE^E. 



2. H.c'diolata Ton.: smooth, somewhat branched above ; radical leaves 

 oval or oblong-spatulate, tapering into a petiole, the margin ciliate ; cau- 

 line oblanceolate ; flowers in corymbose clusters ; peduncles and pedicels 

 short. Houstonia ciliolata Torr. FL. 



Wet banks. Western and Northern N, Y. Can. W. to Miss. May, Aug. 

 1j_. Stems usually numerous, 4 6 inches high, at length spreading. Flowers 

 numerous, terminal, pale purple. Fringed-leaved Hedyotis. 



3. H. longifolia Hook: smooth; stem erect; leaves linear and oblong- 

 linear, tapering at base, rough on the margin, but not ciliate ; radical ones 

 narrow-oval or oblong, tapering into a petiole ; flowers mostly in threes, 

 terminal, nearly sessile. Houstonia longifolia Willd. 



Dry hills and fields. Can. to Flor. W. to Miss. June Aug. 7|_. Stems 

 5 8 inches high, slender, branched at the top, 4-sided. Flowers usually in 

 threes, pale purple. Corolla about thrice as long as the lobes of the calyx. 



Long-leaved Hedyotis. 



4. H. glomerata Ell. : stem erect or somewhat diffuse, branching, pubes- 

 cent ; leaves oblong-lanceolate, attenuate at base or slightly petioled, nearly 

 smooth; flowers in clusters, sessile, axillary and terminal; tube of the 

 calyx hairy, shorter than the lobes. H. auriculata Walt. Oldenlandia 

 glomerata Mich. 



Moist grounds. N. Y. N. J. to Flor. Aug. (1). ? Whole plant dull green. 

 Stem 2 4 inches high, first simple, then branching and assurgent. Flowers 

 usually clustered, small, white. Cluster-flowered Hedyotis. 



5. H. purpurea Torr. fy Gr. : stem erect or ascending, 4-sided, pubescent ; 

 leaves ovate or ovate-lanceolate, closely sessile, 3 5-nerved, smoothish 

 above, lower surface and margins pubescent ; flowers in terminal corymbs ; 

 lobes of the calyx subulate-linear. Houstonia purpurea Linn. 



Woods. Penn. and Virg. W. to Miss, and Tenn. May July. Q\. Stems 

 usually several from the same root, about a foot high, branching. Flowers pur- 

 pie. Purple Hedyotis. 



2. MITCHELLA. Linn. Partridge Berry. 

 (In honor of Dr. John Mitcliell, a botanist of Virginia.) 



Flowers in pairs, with their ovaries united. Calyx 4-toothed. 

 Corolla funnel-form ; tube cylindric ; limb 4-parted, spreading, 

 villous on the inner side. Stamens 4, adnate to the tube, 

 scarcely exserted. Stigma 4-cleft. Berry didymous, 4-seeded. 



M. rcpens Linn.: stem branched, smooth, creeping; leaves opposite, pe- 

 tioled, roundish-ovate, often slightly cordate, smooth, very entire ; flowers 

 terminal, in pairs. 



Woods, among dried leaves. Can. to Flor. W. to Ark. June, July. 1\.. 

 A small evergreen, creeping plant. Flowers white, hairy within, fragrant. 

 Berries red. Partridge Berry. 



3. CEPHALANTHUS. Linn. Button Bush. 



(From the Greek /cf<aX?, a head, and avQos, a flower.) 



Calyx small, angular, inversely pyramidal, 4-cleft. Corolla 

 tubular, slender, 4-cleft. Style much exserted. Stigma glo- 



