1014 VERBENACEAE 



in each cavity. Fruit drupe-like, with a more or less watery pulp. Nutlets 2-celled or 

 separating into 2 one-seeded nutlets. The plants flower throughout the year. 



Flower-heads bracted. but not involucrate. 



Leaf-blades cuneate to rounded at the base, rather finely crenate-serrate. 1. L. Camara. 



Leaf-blades truncate or cordate at the base, coarsely crenate or serrate-crenate. 2. L. horrida. 

 Flower-heads decidedly involucrate. 



Leaf-blades acute or acutish, coarsely toothed : corolla-tube about 10 mm. long. 3. L. Selloiviana. 

 Leaf-blades rounded or retuse at the apex, crenulate: corolla-tube 2-4 mm. long. 



Outer bracts of the involucre ovate. 4. L. involucrata. 



Outer bracts of the involucre lanceolate or oblong-lanceolate. 5. L. odorata. 



1. Lantana Camara L. A branching shrub 1-1.5 m. tall, rigid-pubescent, unarmed, 

 or prickly. Leaf-blades ovate to oblong-ovate, 4-12 cm. long, obtuse, acute, or short- 

 acuminate, finely crenate-serrate, rounded or narrowed at the base : bracts oblong to 

 lanceolate, 4-7 mm. long : calyx very thin, 3 mm. long : corolla yellow or orange ; tube 

 about 1 cm. long, puberulent, slightly curved, barely enlarged above the middle ; limb 6-8 

 mm. high. 



In sandy soil, Georgia to Florida and Texas. Also in tropical America. 



2. Lantana hdrrida H.B.K. A branching shrub mostly 1-2 m. tall, more or less 

 prickly and hirsute. Leaf-blades ovate to orbicular-ovate or deltoid-ovate, 2-7 cm. long, 

 obtuse or acute, coarsely crenate or serrate-crenate, truncate or cordate at the base : bracts 

 narrow : calyx about 2 mm. long : corolla deep yellow or orange-red ; tube 7-9 mm. long, 

 enlarged above the middle ; limb 7-8 mm. high. 



In sandy soil or thickets, Gulf States, Mexico and Central America. 



3. Lantana Sellowiana Link & Otto. A branching shrub 3-18 dm. tall, with 

 tomentulose foliage. Leaf-blades ovate, oval or elliptic-ovate, 1-3 cm. long, acute or 

 acutish, relatively coarsely crenate, abruptly narrowed or truncate at the base ; petioles 

 generally winged below the blade : bracts of the involucre ovate or oblong-elliptic, ciliate, 

 5-6 mm. long : calyx 1 mm. high : corolla magenta or lilac ; tube about 1 cm. long, puber- 

 ulent ; limb 8-10 mm. high, the lower lobe much longer than the others. 



In waste places, pine lands and thickets, Florida. Common in tropical America. 



4. Lantana involucrata L. A much-branched shrub 4-17 dm. tall, with puberulent 

 or thickly tomentulose foliage. Leaves sometimes clustered in the axils ; blades oval, obo- 

 vate to suborbicular, 1-3 cm. long, rounded or retuse at the apex, finely crenate, usually 

 cuneately narrowed at the base : outer bracts of the involucre ovate, 4-7 mm. long, cilio- 

 late : calyx becoming 1.5 mm. long : corolla white, puberulent ; tube 2-4 mm. long, slightly 

 enlarged at the middle ; limb 2-4 mm. high, the lower lobe the largest. 



In sandy soil, pine lands and open hammocks, Florida. Also in tropical America. 



5. Lantana odorata L. Similar to L. involucrata in habit. Leaves similar, but 

 commonly larger : bracts of the involucre narrower, the outer lanceolate or oblong-lanceo- 

 late. [L. involucrata var. Floridana Chapm.] 



In pine lands and hammocks, peninsular Florida. Also in tropical America. 



10. CITHAREXYLUM L. 



Evergreen shrubs, sometimes armed with axillary spines. Leaves opposite, without 

 stipules. Flowers small, in axillary or terminal racemes. Pedicels subtended by minute 

 persistent bracts. Calyx membranous : tube narrowly campanulate, minutely 5-lobed, per- 

 sistent. Corolla mostly white, salverform : tube symmetrical : limb slightly oblique : 

 lobes 5, nearly equal. Stamens 4, adnate, like the staminodium, to the corolla-tube below 

 the middle : filaments filiform-subulate : anthers introrse. Ovary sessile, incompletely 4- 

 celled by the development of 2 parietal placentae. Stigma 2-lobed. Ovules solitary, as- 

 cending, anatropous. Drupe berry -like, subtended by the persistent calyx, with a fleshy pulp 

 and a thick bony stone which separates into 2 flattened 2-seeded nutlets. Seeds elongated* 

 with a membranous testa. Endosperm wanting. 



Leaves 6-12 mm. long : flowers clustered on short spur-like branches. 1. C. brachyanthum. 



Leaves 5-15 cm. long : flowers in slender spikes. 2. C. villosum. 



1. Citharexylum brachyanthum A. Gray. A much branched shrub, with puberulent 

 foliage, the branchlets 4-angled : leaves few, often clustered ; blades linear-spatulate to 

 cuneate or obovate, 6-12 mm. long, obtuse, nerveless, sessile or nearly so, on falling their 

 bases becoming spinescent : flowers clustered on short spur-like branches : calyx pubescent, 

 nearly 4 mm. long ; lobes 5, low : corolla white ; tube about 4 mm. long, campanulate ; 

 lobes rounded, shorter than the tube : fruit subglobose, 6 mm. in diameter. 



On dry plains or hillsides, southern Texas. 



