TETRANDRIA.— MONOGYNIA. 81 



HAB. Sandy wet places. Sept % . Stem purp.; 

 leav. oppos.;Jl. solitary, oppos., white ; cal. subulate. 



109. HEDYOTIS. Rubiacece. 



H. glomerata: stem assurgent ; leaves lanceolate, 

 pubescent, attenuate at the base ; flowers fascicled, 

 axillary and terminal. 



HAB. Moist shady places. Aug. 0. Stern 1 — 3 in. 

 high, simp, or branch., pubes. ;Jl. white, minute. 



110. HOUSTONIA. Gentian*. 



II. casrulea: stem erect, setaceous, dichotomous ; 

 radical leaves spathulate-ovate ; peduncles elonga- 

 ted, 1 -flowered ; segments of the corolla acute. 



HAB. Moist rocks. Apr. — May. U . Stems nume- 

 rous, 4 — 8 in. high; stern leav. narrow ; Jl. blue. 



2. H. longifolia : leaves narrow-lanceolate, tapering at 



each extremity ; flowers terminal, subsessile ; stem 

 branched, smooth. 

 HAB. Mountains. June. If.. Stem suhfaslig. ; Jl. by 

 threes, purp. ; segments ovate, acute. 



3. H. purpurea: stem erect, branched above, pubes- 



cent at the joints ; leaves sessile, ovate or lanceo- 

 late ; fascicles of flowers terminal, corymbose. 

 HAB. Dry woods. July. If. Leaves broad, rounded 

 at base, 3-nerv. ; Jl.. purp. 

 1. H. ciliolata : radical loaves ovale, obtuse, attenuate 

 at the base ; margin ciliate ; stem-leaves ovate- 

 apathulate, sessile; flowers in terminal corymbs, 

 pedicellate ; peduncles trichotomous ; segments of 

 the calyx linear-lanceolate ; stem smooth, branched 

 above. 

 HAB. Moist rocks. If. Stem 4 — 5 in. high; rad. 

 leav. crowded ; Jl. pale purple. 



"». H. pubescens : leaves cuneiform, acute, pubescent; 

 the inferior ones semi-petiolate, lanceolate ; supe- 

 rior ones semi-oval, sessile ; panicle trichotomous 

 terminal. 

 IIAB. Pennsylvania, -f . 



111. MITCHELLA. Partridge-berry. Kubiaco 



M. repent. 



