234 Lxx. RUBIACEJE (HiERif). ISpermacoce. 



Corolla-tube short, not exceeding the caljn-teeth. 

 Margins of the leaves not whitish, more or less 

 scabrous. 

 Leaves ovate or ovate-lanceolate. Flowers very 



small 5. S? pilosa. 



Leaves lanceolate or elliptical. Flowers \ in. 



long 6. 8. senensis. 



Leaves linear or nearly so. 



Capsule small, not more than |- in. long. 

 Branches glabrous or nearly so 

 Calyx-teeth sublinear. Capsule glabrous 



or puberulous 7. 5'. stricta. 



Calyx-teeth linear-spathulate or (in the 



variety) subulate. Capsule pubescent 8. S. hebecarpa. 

 Capsule about ^ in. long. Branches pubes- 

 cent or hirsute-hispid. 

 Setae of the stipxiles as long as the sheath . 9. S. hucadea. 

 Setae of the stipules exceeding the sheath . 10. iS. stachydeal 

 Margins of the leaves whitish, not scabrous . . 11. 8. radiata. 

 Calyx -teeth 2 as long as the ovary, 2 others slender or 

 very small or obsolete. 

 Corolla-tube very short. Nearly glabrous . . . . 12. /SL ramisparsa. 

 Corolla-tube equalling the longer pair of calyx-teeth. 



Hispid-hirsute \Z, 8. RuellicB. 



Bracteoles numerous, conspicuous. Plant not very slender. 

 Stem and branches hispid. Corolla-tube exceeding the 



calyx-teeth 14. /S. dihrachiaia. 



Stem and branches glabrous. Corolla-tube about as 

 long as the calyx-teeth. 



Leaves somewhat hispid beneath 15. jS. Kotschyana. 



Leaves glabrous 16. iS. compacta. 



Leaves at the base of the flower-heads reflexed or obsolete. 



Undershrub 17. /S. glohosa, 



1. S. tenulsslma, Schweinf. mss. in herh. sub Borreria. A very 

 slender glabrous annual, branched above the base. Branches smooth. 

 Leaves narrowly linear, acute, sessile, rigid, sparingly scabrous, ^1 in. 

 long ; stipules with 1-4 short setas about equalling the sheath. Flowers 

 tetramerous, a few together, in small sessile heads terminal and in the 

 upper axils, mixed with small slender bracteoles ; heads usually based 

 by 2 spreading decussating pairs of leaves. Calyx-limb ciliate obscurely- 

 toothed ; teeth subulate, all short or sometimes 1-2 prolonged. Corolla 

 pale purphsh ; tube purplish, slender, exceeding the setas of the stipules.' 

 Capsule puberulous at the apex, small, splitting down from the apex. 



Wile Xiand. Djurland, Schweinfurth ! 



Habit of slender states of Octodon JUifolium, Schum. et Thonn., but calyx-teeth 

 different. 



2. S. filifonuls, Hiern. A very slender unbranched erect annual, 

 ranging up to 2 feet high, more or less hirsute. Stem subterete below, 

 marked with narrow raised lines, compressed above. Leaves linear, 

 acute, wedge-shaped at the sessile base, ^IJ in. loiig ; stipules with 

 cup-shaped hirsute sheath and 2-5 setaa equalling or rather longer than 

 it. Flowers tetramerous, white, delicate, several together, verticillate, 

 forming small heads in the upper axils and terminal, usually based by 



