EUPHORBIACEAE. 237 



seeds ovoid-globose, 3 X '^-^ nun., pointed, vrhite, foveolate with numerous 

 large shallow irregular pits. 



In a sisal field on South Calcos Island: — Hispaniola ; Mona : Porto Rico; 

 Culebra ; Vieques; St. Thomas; St. Jan; St. Martin; Anegada ; Tortola; Martinique 

 and Tobago. Bkoad-leaved Spurge. 



31. CHAMAESYCE S. F. Gray, Nat. Arr. Brit. PI. 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-coccous, 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, Tvidely 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. 'buxifolia. 



Inflorescence throughout the upper axils. 

 Leaves glabrous. 

 Leaves entire. 



Stipules deltoid, acicular-bristled. 2. C. Witsoni. 



Stipules not bristled. 3. C. lecheoides. 



Leaves dentate. 



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



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



Leaves densely tomentose. 6. C. cayensis. 



Leaves canescent, entire. 7. C Bracei. 



Leaves linear or narrowly oblong. 



Leaves 2—4 cm. long, involucres peduncled. 8. C. articvlata. 



Leaves 8-1 2 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. liypericifoUa. 



Leaves narrowly falcate ; seeds black. 11. C. irasiliensis. 



Inflorescence solitary ; leaves ovate, blunt, dentate or 

 entire. 

 Capsule glabrous. 12. C. BlodgettH. 



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



Leaves hairy. 



Inflorescence clustered. 



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



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



Inflorescence solitary; leaves orbicular to elliptic, en- 

 tire or apically denticulate. 16. O. Brittonii. 



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



Euphorbia tuxifolia 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 campanulate, 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 Spuhge. 



