910 SAPOTACEAE 



usually obtuse. Stamens mostly 5, included, adnate to the base of the corolla-lobes or on 

 the tube opposite the lobes: anthers opening lengthwise. Staminodia scale-like, or peta- 

 loid, entire or toothed. Ovary 5-celled or rarely 2-4-celled : style variable. Berry ovoid 

 or subglobose. Seed mostly solitary, with a crustaceous often shining testa. Endosperm 

 fleshy. Embryo central. MASTIC. WILD OLIVE. 



1. Sideroxylon mastichodendron Jacq. A massive tree, sometimes 25 m. tall, 

 with a maximum trunk diameter of about 1.5 m. Leaf -blades leathery, oblong to oval 

 or rarely ovate, 4-15 cm. long, obtuse or short-acuminate at both ends, undulate, bright 

 green and lustrous a*bove, yellowish green and dull beneath, becoming glabrous ; petioles 

 slender, commonly as long as the blade or longer : pedicels 4-7 mm. long : calyx gla- 

 brous ; sepals suborbicular, about 2 mm. long : corolla 6-7 mm. broad, light yellow ; lobes 

 5, oblong or ovate-oblong, obtuse : staminodia lanceolate, long-acuminate, 1 mm. long : 

 stamens about as long as the petals : drupes oval, nearly 2.5 cm. long, yellow : seed 

 obovoid, smooth : pulp rather dry, somewhat acid. 



In hammocks, southern peninsular Florida and the Keys. Fall and spring. 



3. DIPHOLIS A. DC. 



Unarmed shrubs or small trees. Leaves alternate. Flowers in axillary or lateral 

 clusters. Sepals 5, ovate to suborbicular, strongly imbricated, nearly equal. Corolla-lobes 

 5, furnished with 2 appendages at each sinus. Stamens 5, adnate to the corolla-tube, oppo- 

 site the lobes, exserted : filaments filiform : anthers opening lengthwise. Staminodia 5, 

 petaloid, commonly acuminate, keeled. Ovary 5-celled, somewhat 5-lobed, glabrous : 

 style elongated. Berry ovoid or oblong, fleshy. Seed usually solitary, with a leathery 

 testa. Endosperm fleshy. Embryo somewhat lateral. BUSTIC. CASSADA. 



1. Dipholis salicifolia (L. ) A. DC. An evergreen tree, sometimes 16m. tall, with a 

 maximum trunk diameter of about 5 dm. Leaf-blades leathery, elliptic or elliptic-ob- 

 lanceolate, 5-12 cm. long, usually acute at the apex, entire, acuminate at the base into 

 slender petioles, glabrous and lustrous above, dull and glabrous or rarely pubescent 

 beneath : pedicels stout, enlarged upward, 2-3 mm. long : calyx pubescent ; sepals ovate 

 or oblong, 1.5 mm. long, obtuse : corolla 4 mm. broad ; lobes oblong or oval, rounded at 

 the apex, about as long as the tube : staminodia ovate or ovate-lanceolate, laciniate- 

 toothed : appendages at least as long as the corolla-lobes : berries subglobose or oval, 

 about 8 mm. in diameter, black. 



In hammocks, southern peninsular Florida and the Keys. Also in the West Indies. Spring. 



4. BUMELIA Sw. 



Shrubs or small trees, with a milky or gummy sap and a very hard wood. Leaves 

 alternate, their axils sometimes spine-bearing : blades sometimes conspicuously or promi- 

 nently nerved. Flowers mostly perfect, few or many in axillary clusters. Calyx long- 

 pedicelled or nearly sessile, persistent. Sepals unequal, strongly imbricated. Corolla 

 white, deciduous : lobes longer than the tube, with an appendage on each side. Stamens 

 5, adnate to the corolla-tube : anthers versatile. Staminodia 5, petal-like. Ovary 5-celled, 

 pubescent. Ovules 5. Berry drupe-like. Seed mostly solitary, erect. Endosperm want- 

 ing or nearly so. The plants flower in spring and summer. BUCKTHORN. 



A. Leaf-blades glabrous, or merely with scattered hairs or inconspicuously cobwebby beneath. 



Fruit oblong-cylindric. 1. B, angusttfolia. 



Fruit subglobose or oval. 



Leaf-blades of an obovate or spatulate type, mainly broadest above the middle. 



Twigs copiously pubescent with deep red hairs. 2. B. rufotomentosa. 



Twigs glabrous or soon becoming so. 

 Fruit less than 8 mm. long. 



Corolla-lobes about 1.5 mm. long : leaf-blades blunt : fruit 5 mm. long. 3. B. microcarpa. 

 Corolla-lobes about 2 mm. long: leaf-blades retuse: fruit 6-7 mm. long. 4. B. reclinata. 

 Fruit over 9 mm. long. 



Leaf-blades 1-3.5 cm. long : fruit over 10 mm. broad. 5. B. megacocca. 



Leaf-blades 4-10 cm. long : fruit less than 10 mm. broad. 



Corolla-lobes erose-dentlculate : staminodia serrulate : sepals 



glabrous. 6. B. cassintfoha. 



Corolla-lobes entire : staminodia entire : sepals pubescent. 7. B. monticola. 



Leaf-blades of an elliptic type broadest at the middle. 



Pedicels and sepals pubescent. 8. B. Texana. 



Pedicels and sepals glabrous. 



Corolla 3 mm. long ; lobes as broad as long : leaf-blades not reticulated. 9. B. mctaa. 

 Corolla 4 mm. long ; lobes longer than broad : leaf-blades copiously 



reticulated. 10. B, lycioides. 



