DICOTYLEDONS. 201 



ovate to oblong, acute at each end, crenate-serrate, rough above, 

 pubescent beneath, glandular-dotted ; petioles slender ; cymes many- 

 flowered, the peduncle as long as the petiole, pedicels short ; calyx 

 cup-shaped, the teeth short ; corolla double the length of the calyx, 

 blue; fruit violet-purple, very conspicuous in autumn. May-July. 

 Common in fields and thickets. 



IV. VITEX. 



Shrubs ; leaves palmately compound ; flowers in panicled 

 spikes ; calyx short, 5-toothed : corolla cup-shaped, 5-lobed, 

 somewhat bilabiate ; stamens 4, unequal, exserted ; ovary 

 4-celled, style slender ; fruit a drupe. 



V. Agnus-castus L. Chaste tree. Shrub, widely branched, 

 ■1-8 ft. high ; leaflets 5-7, lanceolate, acute at each end, entire ; 

 spikes in terminal panicles, hoary-pubescent ; flowers purple ; corolla 

 tube strongly curved ; fruit a 1-seeded drupe or berry. April-June. 

 Common in cultivation. 



110. LABIATiE. MINT FAMILY. 



Herbs or shrubs, mostly aromatic ; stems 4-angled ; leaves 

 opposite, simple, exstipulate ; flowers perfect, more or less 

 2-lipped, axillary or terminal, often in dense whorls, some- 

 times solitary ; calyx persistent, regular or 2-lipped, usually 

 5-toothed, often prominently striate ; corolla bilabiate or 

 rarely regular, limb 4-o-lobed, upper lip usually 2-lobed, the 

 lower 3-lobed ; stamens 2 or 4, inserted in the corolla tube ; 

 ovary free, 4-lobed, 4-ovuled, the slender style 2-lobed ; fruit 

 4 nutlets, each 1-seeded. 



I. TEUCRIUM. 



Perennial herbs ; stems erect ; leaves entire or toothed ; 

 flowers in terminal spikes or axillary whorls ; calyx tubular, 

 une(pKilly 5-t()otht'd, lO-nerved; corolla tube short, limb 

 ;j-lobed, the 4 upper lobes short, the lower larger, oblong, 

 concave ; stamens 4, didynamous, exserted between the 2 

 uppermost lobes of the corolla, the lower pair longer; style 

 2-cleft ; nutlets rugose. 



