EUPHORBIACEAE. 237 



seeds ovoid-globose, 3 X 2.4 mm., pointed, white, foveolate with numerous 

 large shallow irregular pits. 



In a sisal field on South Caicos Island: Hispaniola ; Monti: Porto Rico: 

 C'ulebra : Vieques ; St. Thomas : St. Jan ; St. Martin ; Auegada ; Tortola ; Martinique 

 and Tobago. BHOAD-LEAVED SPURGE. 



31. CHAMAESYCE S. F. Gray, Xat. Arr. Brit. PL 2: 260. 1821. 



Annual or perennial herbs or shrubs, the stems often diffuse at the base; 

 the branches prostrate or ascending, forking. Leaves opposite, inequilateral, 

 more or less oblique at the base, entire or toothed; stipules minute, entire or 

 lacerate. Inflorescence solitary or capitulate, axillary and terminal ; involucre 

 toothed, glandular on the margin ; glands 4, naked or appendaged (the 5th 

 gland represented by a sulcus in the margin of the involucral tube). Capsule 

 more or less globose, 3-coccons, the cocci sharply angled or rounded; seeds 

 minute, ovoid or elongated-ovoid, more or less quadrangular, the facets smooth 

 or transversely ridged. [Greek, ground fig.] About 225 species, widely dis- 

 tributed. Type species: Chamaesyce maritima S. F. Gray. 



Suffrutescent : leaves thick, mostly entire. 

 Leaves ovate to elliptic or oblong. 



Inflorescence terminal-axillary; plants glabrous. 1. C.ltitxifolia. 



Inflorescence throughout the upper axils. 

 Leaves glabrous. 

 Leaves entire. 



Stipules deltoid, acicular-bristled. 2. C. Wilson!. 



Stipules not bristled. 3. C. lecheoides. 



Leaves dentate. 



Stipules broad, fimbriate-ciliate. 4. C. insulae-salis. 



Stipules narrow, entire, aristate. 5. C. cjruincnsis. 



Leaves densely tomentose. (3. G. caycnsis. 



Leaves canescent, entire. 7. C. Bracei. 



Leaves linear or narrowly oblong. 



Leaves 24 cm. long, involucres peduncled. S'. C. articulata. 



Leaves 8-12 mm. long, involucres sessile. 9. C. vaginulata. 



Herbaceous ; leaves thin, mostly serrate. 

 Leaves glabrous. 



Inflorescence clustered ; leaves oblong, acute, sharply 



serrate. 



Leaves broadly falcate ; seeds red. 10. C. liypcricifolia. 



Leaves narrowly falcate: seeds black. 11. G.brasiliensis. 



Inflorescence solitary ; leaves ovate, blunt, dentate or 



entire. 



Capsule glabrous. 12. C. Blodfictlii. 



Capsule hairy on the angles. 13. C. prostratu. 



Leaves hairy. 



Inflorescence clustered. 



Leaves ovate to lanceolate, sharp-serrate, acute. 14. C. hirta. 



Leaves ovate, crenate-dentate, obtuse. 15. C. Berteriana. 



Inflorescence solitary ; leaves orbicular to elliptic, en- 

 tire or apically denticulate. 1G. C. Brittonii. 



1. Chamaesyce buxifolia (Lam.) Small, Fl. SE. U. S. 711. 1903. 

 Euphorbia buxifolia Lam. Encye. 2: 421. 1788. 



Low, generally erect, glabrous, shrubby, fleshy, 2-5 dm. high; branches 

 usually many. Leaves glabrous, thick, wrinkling in drying, ovate or broadly 

 oblong, 8-12 mm. long, obliquely subcordate at the base, acutish, margin entire, 

 involute ; petioles about 1 mm. ; involucres eampanulate, about 1.5 mm., as long 

 as the peduncles or shorter ; glands transversely oblong ; appendages a mere 

 whitish bordering line; capsule broad, glabrous; seeds white, ovoid-quadrang- 

 ular, somewhat apiculate, 1.2 X 1 mm., the angles very blunt ; facets very 

 shallowly broad-pitted by indistinct and irregularly anastomosing transverse 

 ridges. 



Maritime sands throughout the archipelago : Bermuda ; Florida ; coasts of the 

 Gulf of Mexico and the Caribbean Sea. COAST SPURGE. 



