SPIGELIA. LXXU. RUBIACE^E. 307 



with the calyx ; seeds 2, peltate, furrowed on the face. Mostly her- 

 baceous and tropical. Fls. small, axillary, sessile, whorled. 



S. GLABRA. MichX. 



Glabrous, procumbent at base ; Ivs. opposite, lanceolate, entire ; ichorh 

 many-flowered ; col. 4-tootked (rarely 5) ; cor. funnel-form, short, hairy in the 

 throat; anthers included in the tube; stig. subsessile. River banks, Western 

 States ! Stem 1 2f long, terete, with 4 prominent lines, branched. Leaves 

 2 3' by i 1' , tapering to each end. Flowers white, 8 20 in a whorl, sub- 

 t .nded by the subulate bracts of the stipules. Jl. Aug. Resembles some of 

 he Labiatse. 



5. DIODIA. 



Gr. its, twice, odovs, tooth ; alluding to the two calyx teeth crowning the ovary. 



Calyx, corolla, stamens, style and fruit, as in Spermacoce, except 

 that the (2 or 3) 1 -seeded, separable carpels are both indehiscent ; 

 seeds oval, peltate. American, chiejly tropical herbs, with the habit of 

 Spermacoce in all respects save the indehiscent carpels. 



1. D. VIRGINIAN A. ^Spermacoce. A. Rich.} 



Procumbent, nearly glabrous or hirsute; Ivs. lanceolate-linear, sessile, 

 entire ; bristles of the stipules longer than the sheaths ; fls. solitary, opposite; co- 

 niUa tube thrice longer than the calyx ; sta. exserted ; sty. deeply 2-clefl, the 

 lobes filiform. % Damp places, 111. to Ga. ! and La. Stem 1 2f long, some- 

 what 4-sided. Leaves 1 2' by 2 4", 1-veined, often with smaller ones fasci- 

 cled in the axils. Corolla 5" long, hairy inside. May Sept. 



2. D. TERES. Walt. (Spermacoce diodina. Michx.) 



Procumbent or ascending, hairy or scabrous; Ivs. linear-lanceolate, sessile, 

 rough-edged, acute, much longer than the sheaths or fruit ; fls. solitary or several 

 in each axil ; cor. funnel-form, with a wide tube, twice longer than the calyx ; 

 jr. somewhat hairy and 4-sided. Sandy fields, N. J. to 111. Mead! and South- 

 ern States. Stems rather rigid, much branched, 5 18' long, brownish. Leaves 

 about T by 2". Corolla reddish-white, shorter than the reddish-brown bristles. 



6. CEPHALANTHUS. 



Gr. K(l>a\n, a head, avStJj, a flower; flowers growing in dense heads. 



Calyx limb 4-toothed ; corolla tubular, slender, 4-cleft ; stamens 4 ; 

 style mnch exserted. Shrubs with opposite leaves and short stipuks. 

 Fls. in globose heads, without an invol. 



C. OCCIDENTALIS. Blltton Bush. 



Lrs. opposite, and in 3s, oval, acuminate, entire, smooth ; hds. peduncu- 

 late. A handsome shrub, frequenting the margins of ponds, rivers and brooks. 

 U.S. and Can. 

 which are near 

 (Platanus occidentalis). 

 2 3'. The flowers are tubular, with long, projecting" styles, and are inserted 

 on all sides of the round receptacle. July. 



SUBORDER 3. S PIGEL.IEJE. 



Calyx persistent, almost entirely free from the ovary. Leaves oppo 



site 3 with intermediate stipules. 



7. SPIGELIA. 



In honor of Adrian Spigelius, Prof, of Anat and Surg. at Padua, 15781625. 



Calyx 5-parted, segm. linear-subulate ; cor. narrowly funnel-form, 

 limb 5-cleft. equal ; stam. 5 ; anth. convergent ; caps, didymous, 2- 

 celled, few -seeded. Herbaceous or suffrutescent. Lvs. opposite. Stip 

 ules small, interpetiolar. Fls. sessik, in terminal spikes. 



