•306 VERBENACE^. (vERVAIN FAMILY.) 



Synopsis. 



Tribe I. 'yERBi:NX:.^. — Ovule solitary, erect from the base of the cell, anatropous. 

 Radicle pointing downward. Flowers in spikes or heads. 



* Herbs. Fruit dry. • 



1. PRIVA. Stamens 4. Fruit of 2 two-celled nutlets, enclosed in the inflated calyx. 



2. VERBENA. Stamens 4. Fruit of 4 one-celled nutlets. Fruiting calyx not inflated. 



3. STACIIYTARPIIA. Stamens 2. Fruit of 2 one-celled nutlets, imbedded in excavations of 



the thickened rachis. 



4. LIPPIA. Stamens 4. Fruit of 2 one-celled nutlets. Flowers capitate. 



* * Shrubs. Fruit fleshy or pulpy. 



5. LANTANA. Fruit of 2 one-celled nutlets. Flowers capitate. 



6. CITHAREXYLUM. Fruit of 2 two-celled nuTlets surrounded by the cup-shaped calyx. 



Flowers spiked. 



7. DURANTA. Fruit of 4 two-celled nutlets enclosed in the beaked calyx. 



Tribe II. VITE.K. — Ovule solitary, suspended from the inner angle of the cell, am- 

 phitropous. Radicle pointing downward. Flowers in cymes. Fruit baccate. 



8. CALLICARPA. Fruit of 4 separate 1-celled nutlets. Shrubs. 



Tribe III. AVICENNIjE. — Ovules by pairs, suspended from the apex of the cell, 

 amphitropous. Radicle pointing downward. Flowers in imbricated spikes or heads. 

 Fruit capsular. 



9. AVICEXNIA. Embryo large, germinating within the capsule. Trees. 



Tribe IV. PHRYBIEjE. — Ovule solitary, erect from the base of the 1-ceIIed ovary, 

 orthotropous. Radicle pointing upward. Cotyledons convolute around their axis. 

 Flowers in elongated slender spikes. Fruit a caryopsis. 

 10. PHRYMA. Corolla bilabiate. Stamens 4, didynamous. Fruit reflexed. 



1. PRIVA, Adans. 



Calyx tubular, 5-toothed. Corolla salver-shaped, 5-cleft. Stamens 4, didy- 

 namous, included. Ovary 4-celled. Style persistent. Fruit dry, separating 

 into two 2-celled spiny-angled nutlets, and included in the inflated membrana- 

 ceous calyx. — Perennial herbs, with serrate petioled undivided leaves, and mi- 

 nute floWers in a loose slender spike. 



1. P. echinata, Juss. Smooth or hispid ; stem branching ; leaves cordate- 

 ovate, acute, coarsely serrate; flowers alternate; fruiting calyx bristly with 

 hooked hairs, ovoid ; fruit ovate, 4-angled, the angles armed with tubercular 

 spines, pointed by the persistent bent style. — South Florida. — Leaves l'-2' 

 long. Spikes 6' - 9' long, terminal and in the forks of the stem. 



2. VERBENA, L. Vervain. 



Calyx tubular, 5-ribbed, .5-toothcd. Corolla salver-shaped, bearded in the 

 throat ; the limb somewhat bilabiate, 5-Iobcd. Stamens 4, didynamous, included. 

 Stigma 2-lobed. Ovary 4-celled. Fruit of 4 separate 1-seedcd nutlets. — Herbs, 

 with serrate or pinnately divided leaves, and mostly small flowers in lengthen- 

 ing slender spikes. 



