82 EUPHORBIACEAE. 



12. C. Tracyi Small. Branches thinly canescent: leaf -blades oblong to slightly 

 broadest above the middle: involucres fully 1 mm. long, sparingly pubescent: 

 gland-appendages minute, unequal and uneven: capsules nearly 2 mm. broad, 

 slightly pubescent all over: seeds less than 1 mm. long. — Coastal sand-dunes 

 and hammocks, U. keys. — [E. K.] 



13. C. adenoptera (Bertol.) Small. Branches closely villous: leaf -blades oblong 

 or ovate-oblong: involucres 1-1.5 mm. long, finely pubescent: gland-appendages 

 white or pink, petaloid, 2 of them much larger than the glands: capsules about 

 1.5 mm. broad, densely pubescent: seeds about 1 mm. long. — Pinelands and 

 sandy places, L. keys, L. S. keys. — [E. K.] 



14. C. Mrta (L.) Millsp. Branches closely pubescent: leaf -blades oblong to 

 oblong-lanceolate, or somewhat triangular, often prominently blotched: invo- 

 lucres mostly in axillary clusters, 1 mm. long or less, minutely pubescent: 

 gland-appendages obsolete or nearly so: capsules fully 1 mm. broad, finely 

 pubescent: seeds about 1 mm. long. — Hammocks, U. keys, L. keys. — [E. K.] — 

 {Ber., Bah., Cuba, Ant.) 



15. C. gemella (Lag.) Small. Similar to C. Mrta but smaller, and with more 

 closely prostrate branches: leaf -blades oblong to oblong-lanceolate, mostly 

 evenly green: involucres mostly in terminal clusters, about 1 mm. long, finely 

 pubescent: gland-appendages white, narrower than the glands: capsules fully 

 1 mm. broad, often closely pubescent: seeds less than 1 mm. long. — Hammocks 

 and sandy places, U. keys, L. keys. — [E. K.] — (Ber., Bah., Cuba, Ant.) 



''< 18. TITHYMALXJS Adans. Annual or perennial herbs or partially 

 woody plants, topped by an umbel. Leaf-blades entire or finely toothed. 

 Involucres in open or compact cymes, each with 4 naked or merely horned 

 glands. Capsule smooth or tuberculate. Seeds pitted. — Spurge. 



1. T. trichotomus (H. B. K.) Kl. & Garcke. Stems 1-4 dm. tall: leaf -blades 

 cuneate to oblong, 0.5-1.2 cm. long: bracts similar to the leaves: involucres 2 

 mm. long; glands obreniform: capsules about 4 mm. broad, minutely wrinkled: 

 seeds subglobose, fully 1.5 mm. in diameter. — Coastal sand-dunes and sandy 

 shores, U. keys, L. keys, L. S. keys. — [E. K.] — {Bah., Cuba, Ant.) 



19. POINSETTIA Graham. Annual, biennial, or perennial herbs or 



woody plants. Leaf-blades entire, toothed, or lobed, those of the upper ones 



often like the bracts highly colored or discolored. Involucres solitary or 



cymose, each with 1, or rarely 3 or 4, unappendaged glands. Capsule smooth. 



Seeds tuberculate. — Spurge. 



Leaves, at least those of the main stem, and the bracts, with broad, toothed, pan- 

 durate or pinnately lobed blades, those of the branches often narrow : plants 

 pubescent : involucral glanda mostly solitary. 

 Broad leaves with toothed blades. 1. P- hetcrophylla. 



Broad leaves with pandurate or pinnately lobed blades. 2. P. cyathophora. 



Leaves throughout the plant with very narrowly linear entire 



blades : plants glabrous : involucral glands mostly 3 or 4. 3. P. pincioruin. 



1, P, heterophylla (L.) Small. Perennial, stems 3-12 dm. tall: leaf-blades 

 obovate, oblong, or ovate, or narrower, especially on the branches, 5-15 cm. 

 long: involucres campanulate, mostly over 3 mm. long: capsules 3.5-4 mm. 

 long: seeds 3-3.5 mm. long, prominently tuberculate. — Hammocks, U. keys, L. 

 keys, L. S. keys.— [E. K.]— (Ber., Bah., Cuba, Ant.) 



2. P. cyathophora (Murr.) Small. Annual, stems 1.5 m, tall or less, pubes- 

 cent: leaf -blades oblong or oval, varying to obovate or ovate, or narrower 

 especially on the branches, 5-18 cm. long: involucres campanulate, 3.5-4 mm. 

 long: capsules 4-4.5 mm. long: seeds 3-3.5 mm. long, tuberculate. — Hammocks, 

 and cultivated grounds, U. keys, L. keys. — [E. K.] — {Ber., Bah., Cuba, Ant.) — 

 Painted-leap. 



