VEKBENACEAE. 115 



1. H. Leavenworthii Torr. Shrub with pale-pubescent stems, 2-11 dm. tall: 

 leaf -blades linear to linear-elliptic, 1-2 cm. long: calyx-lobes lanceolate, 3-4 

 mm. long: flowers inodorous: corolla pale-yellow; lobes ovate, obtuse. 

 HELIOTROPE. 



Everglades and low hammocks, E. Keys and F. Keys. (Endemic.) 



FAMILY 5. VERBENACEAE. VERVAIN FAMILY. 



Herbs, shrubs, or trees. Stems commonly angled. Leaves alternate, 

 opposite, or whorled: blades simple or rarely compound. Calyx of 4 or 

 5 partially or wholly united sepals. Corolla of 4 or 5 partially united 

 petals, sometimes 2-lipped. Androecium of 2 or 4 stamens, the filaments 

 more or less adnate to the corolla-tube. Gynoecium 2-^4-carpellary, the 

 style terminal. Fruit baccate or drupaceous or an aggregate of 2 or 4 

 nutlets. 



Inflorescence centripetal : ovules erect. 



Flowers in heads, spikes or spike-like racemes. 



Fruit of 2 or 4 nutlets, dry. 1. GONIOSTACHYUM. 



Fruit drupaceous. 2. LANTANA. 



Flowers in open racemes. 



Drupe seated in the calyx : nutlets 2 : stigma 2-lobed. 3. CITHAKEXYLUM. 

 Drupe enclosed in the calyx : nutlets 4 : stigma 4-lobed. 4. DUKANTA. 

 Inflorescence centrifugal, cymose : ovules laterally attached. 



Corolla regular : stamens equal. 5. CALLICABPA. 



Corolla irregular : stamens paired. 



Drupe with two, 2-celled or four 1-celled stones : leaf- 

 blades simple. 6. CLERODENDBON. 

 Drupe with one, 4-celled stone : leaf-blades compound. 7. VITEX. 



1. GONIOSTACHYUM Small. Shrubs or shrubby plants. Leaf-blades 

 mostly toothed. Flowers in congested axillary spikes, the bracts 4-ranked, of 

 an ovate type, keeled. Calyx flattened, 2-lobed. Corolla 2-lipped: tube gla- 

 brous within, much longer than the calyx. 



1. G. citrosum Small. Stems pale-gray or whitish: leaf -blades lanceolate to 

 elliptic-lanceolate, 2.5-6 cm. long, shallowly serrate, pubescent : spikes depressed, 

 short-peduncled, 4-6 mm. long: bracts ovate: calyx about 1 mm. long: corolla 

 white, about 4.5 mm. long; limb about 3 mm. broad: nutlets 1.5 mm. wide. 

 Hammocks, E. Keys. (W. I.) 



2. LANTANA L. Shrubs or rarely herbs, sometimes prickle-armed. 

 Leaf -blades toothed. Flowers in congested, flat-topped spikes. Calyx shallowly 

 2-5-lobed or truncate. Corolla white or colored: tube slightly curved: limb 

 irregular. Stamens 4. Drupes more or less juicy. 



Flower-heads bracted, but not involucrate. 



Stem and branches prickle-armed: leaf-blades strigose : corolla-tube over 12 mm. 

 long. 

 Stems and branches sparingly armed with weak more or 



less curved prickles : corollas yellow to orange. 1. L. Camara. 



Stems and branches copiously armed with stout, rigid, 



hooked prickles : corollas yellow to purple. 2. L. aculeata. 



Stem and branches not prickle-armed : leaf-blades not stri- 

 gose : corolla-tube 10 mm. long or less. 

 Plants with prostrate stems and branches : drupes 2.5-3.5 



mm. long. 3. L. depressa. 



Plants with erect stems and branches : drupes 4-5 mm. 



long. 4. L. ovatifolia. 



Flower-heads decidedly involucrate. 



Leaf-blades acute or acutish, coarsely toothed : corolla-tube 



about 10 mm. long. 5. L. Sellowiana. 



Leaf-blades rounded or retuse at the apex, crenulate : corolla- 

 tube 2-4 mm. long. 



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



Outer bracts of the Involucre lanceolate or oblong-lanceo- 

 late. 7. L. odorata. 



