290 XCIII. YERBENACE^. 



3. VERBENA, Linn. 



Calj^x tubular, plaited, 5-ribbed, 5-tootbed. Corolla nearly 

 salver-shaped ; tube cylindrical, widening upwards, straight or 

 curved, villous on the inside at the insertion of the stamens 

 and bearded in the throat ; limb sub-2-labiate, unequally 5-fid. 

 Stamens 4, included ; anthers ovate, subdidynamous. Ovary on 

 a ring-like disk, 4-celled ; style equalling the stamens, 2-fid or 

 2-lobed, one of the arms stigmatose, the other horn-like, 

 barren. Fruit enclosed in the calyx, separating into 4 pieces, 

 dry, striate or ridged. — DC. Frod, xi. p. 535. 



Herbs or undershrubs, chiefly American. Stems 4-sided. Leaves oppo- 

 site or ternate, very rarely alternate, entire or multifid. Flowers in spikes 

 or heads. — V. Bonariensis is naturalized at the Cape, and V. officinalis is 

 common and seems to be truly wild. 



4. BOUCHEA, Cham. 



Calyx tubular, elongate, 5-plaited and angled, subequally 

 5-tootlied, truncate between the teeth. Corolla somewhat 

 salver-shaped, the limb oblique, sub-2-labiate. Stamens in the 

 throat of the corolla, 4, didynamous, included ; anthers ovate, 

 subdidymous. Ovary on a fleshy or disk-like gynophore, 2- 

 celled : cells 1-ovuled ; style equalling the stamens ; stigma 

 bent on one side, dilated into a sub-2-lobed, more or less in- 

 folded lamina. Fruit enclosed in the split and gaping calyx, 

 of 2 pieces, either separating at maturity or cohering, dry and 

 hard, mostly smooth. — DC. Frod. xi. p. 557 ; Thes. Cup. t. 28, 

 t. 190. 



Herbs or halfshrubs. Leaves opposite, entire, toothed or pinnatifid. 

 Flowers in terminal spikes. — Several Cape species, Eastern. 



Calyx tubular, compressed, membranous, with herbaceous 

 (rarely only 2 marginal) ribs, commonly with 2 facial and 3 ob- 

 solete dorsal ribs, mostly plaited, truncate or 5-toothed or 

 cleft on one side, or 2-fid, the lobes 2-toothed or entire. Co- 

 rolla funnel- or salver-shaped, with straight or curved tube, 

 the throat minutely pubescent ; limb subequally 5-fid. Sta- 

 mens included, the two upper without anthers, lower pair fer- 

 tile ; anthers 2-celled, cells linear-oblong, superposed. Ovary 

 on an annular disk, 2-celled ; cells 1-ovuled ; style capillary ; 

 stigma terminal, peltate-capitate. Fruit enclosed in the 

 slightly enlarged calyx, of 2 separable pieces. — DC. Frod. xi. 

 p. 5G1. 



Herbs or shrubs, chiefly American. Flowers in dense, bracteate spikes. 

 — 1 or 2 Cape species, probably naturalized. 



