RUBIACEyE. CLXXXVI. SPERMACOCE. CLXXXVII. HEXASEPALUM. 



623 



urceolate, sinuately-quadrifid. fj . S. Native near Santa Fe 

 de Bogota. Corolla, genitals, and fruit unknown. 



Trailing Button-weed. Shrub procumbent. 



53 S. ? ERIOCLADA (D. C. prod. 4. p. 557.) plant suffruticose, 

 ascending ; branches rather angular, clothed with hairy tomen- 

 tum ; leaves oblong, acuminated, very scabrous on both surfaces, 

 almost veinless, with serrately scabrous edges, and sometimes 

 mucronate at the apex ; bristles of stipulas glabrous, length of 

 sheath, which is villous ; heads of flowers terminal, girded by 4 

 leaves ; teeth of calyx 4, equal ; stamens exserted. Ij . S. Na- 

 tive of Peru. S. scaberrima, Bartl. in herb. Hsenke, but not of 

 Blume. Fruit unknown, and therefore the genus is doubtful. 

 The habit is that of Borreria. 



Var. |3, linearifolia (D. C. prod. 4. p. 557.) leaves linear, dis- 

 tinctly mucronate. Jj . S. Native of Peru. 



Woolly-branched Button-weed. Shrub ascending. 



** * * * 



Species natives of Guiana. 



54 S.? SEXANGULA'RIS (Aubl. guian. 1. p. 61. t. 22. f. 8.) 

 plant glabrous, prostrate ; stem flexuous, prostrate, hexagonal : 

 leaves ovate, acute, petiolate ; heads of flowers terminal ; anthers 

 in the throat. Native of Guiana, on the banks of rivers. S. 

 hexagona, Willd. spec. 1. p. 569. Flowers small, blue. Perhaps 

 a species of Borreria nearly allied to B. alata. 



Six-angled-stemmed Button-weed. PI. prostrate. 



55 S. ? PROSTRA'TA (Aubl. guian. 1. p. 58. t. 20. f. 3.) gla- 

 brous ; stem herbaceous, prostrate, oppositely branched, tetra- 

 gonal ; leaves almost sessile, elliptic, acute, smooth ; flowers 

 verticillate. Native of Guiana, on the banks of rivers. Flowers 

 small. Leaves pale green. 



Prostrate Button-weed. PI. prostrate. 



56 S. ? RADI'CANS (Aubl. guian. 1. p. 58. t. 20. f. 4.) gla- 

 brous ; stem herbaceous, alternately branched, prostrate, radi- 

 cant ; leaves almost sessile, lanceolate, acute ; flowers verticil- 

 late. TJ. . 8. Native of Guiana, on the banks of the river 

 Orapu. The rest unknown. 



Rooting Button-weed. Fl. July. Clt. 1803. PI. creeping. 



57 S. ? CCERULE'SCENS (Aubl. guian. 1. p. 57. t. 19. f. 2.) 

 stem simple, straight, tetragonal ; leaves ovate, acute, rather 

 hairy, smooth ; bristles of stipulas about equal in length to the 

 flowers ; flowers verticillate ; stamens exserted. Native of 

 Guiana and Cayenne, on the edges of fields. Vahl. eclog. 1. p. 

 9. Corollas blue. Fruit unknown. 



Bluish-fiovfered Button-weed. PI. 1 to 2 feet. 



58 S. LATIFOLIA (Aubl. guian. 1. p. 56. t. 19. f. 1.) glabrous; 

 stem, erect, herbaceous, tetragonal ; leaves ovate, acuminated, 

 petiolate, rough ; bristles of stipulas hispid, a little longer than 

 the sheath ; flowers axillary, verticillate ; limb of calyx 4-tooth- 

 ed, rather villous, as well as the capsules, which are ovate. 

 Native of Guiana and Cayenne by way sides. Lam. ill. t. 62. 

 f. 2. Probably a species of Borreria or Mitracarpum. Flowers 

 white. 



Broad-leaved Button-weed. Fl. July. Clt. 1803. PI. 2 to 

 3 feet. 



* Species natives of Mexico. 



59 S. POLYCE'PHALA (Bartl. in herb. Haenke, ex D. C. prod. 

 4. p. 558.) stem herbaceous, erect, branched, quadrangular, vil- 

 lous ; leaves ovate-lanceolate, acuminated, pilose on both sur- 

 faces, lined with veins beneath ; bristles of stipulas longer than 

 the sheath, hairy ; heads of flowers terminal, nearly globose, 

 girded by 4-leaved involucra ; teeth of calyx subulate, nearly 

 equal ; stamens exserted. Native of Mexico. Perhaps a species 

 of Borreria. 



Many-headed Button-weed. PI. 2 to 3 feet. 



60 S. ? ECHIOIDES (H. B. et Kunth, nov. gen. amer. 3. p. 



344.) stem herbaceous, tetragonal, erect, hispid ; leaves lanceo- 

 late, acuminated, petiolate, hispid on both surfaces ; stipulas his- 

 pid, ciliated by bristles ; whorles of flowers nearly globose, axil- 

 lary and terminal. "$. . S. Native of Mexico, near Campeche. 

 There is a variety of this with glabrous stems, and narrower less 

 hispid leaves. 



Buglos-like Button-weed. PI. 



61 S.? DivEUsiEOLiA(H.B.et Kunth, nov. gen. amer. 3. p. 341.) 

 plant herbaceous, erect, with tetragonal branches, which are sca- 

 brous from retrograde bristles ; leaves linear, with remotely sca- 

 brously serrulated margins : the lower ones minute and oblong- 

 elliptic ; stipulas smoothish, fringed by bristles ; heads of flowers 

 terminal; calyx 2-4-toothed ; capsules hispid. Q. F. Native of 

 Mexico. Knoxia simplex, Willd. in Roam, et Schultes, syst. 3. 

 p. 532. Perhaps a species of Borreria. Flowers white. 



Diverse-leaved Button-weed. PI. 



62 S. ? RECLINA'TA (Nees, hor. berl. p. 50.) plant glabrous, 

 ascending, herbaceous ; leaves lanceolate, acute, smooth, vein- 

 less ; stipulas downy, furnished with 5 bristles each ; heads ter- 

 minal, dense, hemispherical, supported by 2 leaves ; calyx and 

 fruit glabrous. 3. S. Native of Mexico. Fruit unknown. 



Reclinate Button-weed. PI. ascending. 



******* 



Species natives of North America. 



63 S. ? LASIA'NTHA (Rafin. fl. lud. p. 76.) stem weak ; 

 branches diffuse ; leaves sessile, oblong, acute, nerved : nerves 

 scabrous ; flowers verticillate ; corolla woolly inside. Native of 

 Louisiana. 



Woolly-flowered Button-weed. PI. diffuse. 



64 S. ? GLA'BRA (Michx. fl. bor. amer. 1. p. 82.) plant gla- 

 brous, procumbent ; leaves ovate-lanceolate ; whorles many- 

 flowered. O- H. Native of North America, on the banks of 

 the Ohio and Mississippi. Diddia glabra, Pers. ench. 1. p. 124. 

 Flowers white, longer than those of S. tenilior. Fruit un- 

 known. 



Glabrous Button-weed. Fl. July, Aug. Clt. 1823. PI. pro- 

 cumbent. 



65 S.? INVOLUCRA'TA (Pursh, fl. amer. sept. 1. p. 105.) plant 

 very hispid, herbaceous, erect ; stem alternately branched ; 

 leaves ovate-lanceolate, acuminated, hairy on both surfaces ; sti- 

 pulas of many bristles ; heads terminal, involucrated ; tube of 

 corolla very long ; stamens exserted. Native of Carolina. 

 Flowers white. Leaves rather broad. According to Sprengel 

 this is a variety of Crusea rubra. Fruit unknown. 



Involucrated-fiowered Button-weed. PI. 1 foot. 



Cult. See Borreria, p. 618. for culture and propagation. 



CLXXXVII. HEX ASE'PALUM (from %, hex, six, and <r 7ra- 

 \ov, sepalon, an alteration of TreraXov, a sepal ; in reference to the 

 limb of the calyx being 6-parted, indicating its being composed 

 of six sepals). Bartl. in herb. Haenke, ex D. C. prod. 4. p. 561. 



LIN. SYST. Tetrdndria, Monogy'nia. Calyx with an oblong 

 obpyramidal tube, and a 6-parted limb ; lobes narrow, nearly 

 equal, acute, permanent. Corolla campanulately funnel-shaped, 

 with an obconical tube, and 4 lanceolate acute lobes, which are 

 valvate in aestivation. Stamens 4, shorter than the lobes of the 

 corolla. Fruit oblong, dry, ribbed, divisible into 2 parts at the 

 dissepiments : the dissepiment being double, both the parts of the 

 fruit or nuts are closed, and 1-seeded. A small ascending much 

 branched glabrous shrub, with diffuse flexuous compressed 

 branches. Leaves opposite, long-linear, acute, with the margins 

 hardly scabrous. Stipulas sheathing, furnished with many bris- 

 tles, which are equal in length to the sheath, intermixed with very 

 short ciliae. Flowers axillary, solitary, sessile, larger than in 

 any other genus belonging to the tribe Spermacdceae. 



1 H. ANGUSTIFOLIUM (Bartl. 1. c.) T? . S. Native of Mexico, 



