ORDER 67. RUBIACE^E. 149 



insei ted on the corolla. Stig. 4. Berry composed of the 2 united ovaries, 

 each 4-seeded. [^ Smooth. Leaves opposite. 



M. retpens L. Woods : com. Sts. creeping, 6-18'. Lvs. roundish-ovate, petiolate, ever- 

 green. Cor. reddish-white, fragrant. Berry red, seeds (nutlets) bony. Very pretty. Jn. 



4. SFERMACOCE, L. Cal. 2-4-parted. Cor. tubular, limb 4-lobed. 

 Stam. 4. Stig. 2-cleft. Fr. dry, 2-celled, crowned with the calyx, separat- 

 ing into 1 open and 1 indehiscent carpel. Sds. 2. Low herbs. Stip. bristly. 

 Flowers small, in dense, axillary, sessile whorls, or clusters, white. 



1 S. glabra MX. Glabrous ; Ivs. lanceolate ; cal. 4-toothed ; cor. funnel-form, short, 



throat hairy ; anth. included in the tube ; stig. subsessile. if. River banks, W. 1 2f. 



2 S. Chapmanii T. & G. Nearly glabrous ; Ivs. oblong-lanceolate ; cor. funnel-form, 



thrice longer than the calyx ; stam. and sty. exscrted. Fla. Ga. 10'. 



3 S. Involucrata Ph. Hispidly hairy ; Ivs. ovate-lanceolate ; heads terminal, invo- 



lucrate ; stam. exserted. Carolina (Fraser). If. Leaves oblique. 



5. DIODIA, L. Carpels 2, rarely 3, separating, each 1-seeded and inde- 

 hiscent. Fls. otherwise as in Sperm acoce. Herbs. Stip. fringed with 

 bristles. Fls. few or solitary, axillary, sessile, small, white ; the tube often 

 slender. Summer. 



1 D. Virginica L. Procumbent ; Ivs. lanceolate, sessile ; corolla tube slender, with a 



broad, spreading limb ; sta. exserted. H Damp places. 1 2f. Varies with the Ivs. 

 ovate-lanceolate ; also with the leaves more or less hairy. 



2 D. teres Walt. Erect or ascending, nearly terete ; Ivs. lance-linear, rigid, sessile ; 



bristles long ; cor. reddish-white, with a wide tube and short limb ; sta. scarcely ex- 

 serted. Sandy fields, N. J. to 111., and S. &W. 



6. HOUSTONIA, L. BLUETS. Cal. 4-toothed or cleft, persistent. Cor. 

 tubular, the 4 lobes spreading. Fil. 4, inserted on the corolla. Stylo 1. 

 Anth. and stig. dimorphous, that is, in some plants the former exserted 

 and the latter included in others the style exserted and anthers included. 

 Caps. 2-lobed, the upper half free, cells few- (8-20)-seeded. Herbs. Stip. 

 connate with the petiole, entire. Fls. solitary or in cymes, white, bluish, &c. 



Corolla salver-form, glabrous. Peduncles 1-flowered a terminal Nos. 1, 2 



a axillary Nos. 3, 4 



Corolla funnel-form. Peduncles CO-flowered, cymous. b Lvs. lance-ovate No. 5 



b Lvs.lance-linear..Nos. 6,7 



1 H. coerulca L. Dwarf Pink. Innocence. Csespitous ; radical Ivs. ovate-spatulate, 



petiolate ; sts. erect, numerous, dichotomous ; ped. filiform, 1-2-flowered. @ Moist 

 soils. 3 5'. Flowers S", pale blue, with a yellow centre. May, June. Pretty. 

 /3. minor. Branches divaricate ; flowers smaller (3 V wide). South. 



2 H. serpyllifolia MX. Csespitous ; sts. filiform, procumbent ; Ivs. roundish-ovaie, 



petiolate, ciliolate ; ped. terminal, very long. 2f Mts. of Car., Tenn. 612'. May Jl. 



3 H. minima Beck. Glabrous ; Ivs. linear-spatulate ; ped. at first nearly radical, at 



length axillary, often not longer than the leaves ; seeds concave, smooth. @ Prairies, 

 111. to La. 13'. Flowers rose-color, 3 4". March May. 



4 H. rotundifolia MX. Procumbent, creeping, leafy ; Ivs. roundish-oval, abrupt at 



base, petiolate ; ped. mostly longer than the leaves ; caps, emarginate, few-seeded. 

 it Sandy, damp places, S. In patches. 25'. Flowers white. Mar. Dec. 



5 H. purpurea L. Erect ; Ivs. 3-5-veined, closely sessile ; cymes 3-7-flowered, often 



clustered; calyx segm. lance-linear, longer than the pod. 2f Penn., S. and W. If. 

 White-purple. May July. Very pretty. 



