MINT FAMILY. 243 



L. nivea, from Brazil, has the pleasant-scented flowers white and unchang- 

 ing; or, in var. MUTABILIS, changing to bluish. 



L. involucrata, of West Indies, has small obovate and prominently veiny 

 leaves, more or less downy beneath, and heads of lilac-purple flowers, involucrate 

 by the outer bracts. 



L. Sellowiana, of Southern Brazil, is low and spreading, with wedge- 

 oblong or ovate strongly veined leaves, long peduncles, and heads of reddish- 

 purple flowers lengthening somewhat with age. 



5. CALLICARPA. (From Greek for beautiful fruit.) Fl. early summer. 

 C. Americana, FKEXCH MULBERRY. Rich soil from Virginia S. : shrub 



3 - 8 high, with some scurfy down, especially on the lower face of the ovate- 

 oblong toothed leaves, and the clusters of bluish flowers ; fruits violet-blue and 

 showy. 



6. VITEX, CHASTE-TREE. (The ancient Latin name.) 



V. Agnus-castUS, CHASTE-TREE, of Mediterranean region, has 5-7 lan- 

 ceolate entire leaflets whitened underneath, and bluish flowers in sessile clusters 

 forming an interrupted spike at the end of the branches ; hardy only S. 



V. incisa, of Northern China, barely hardy in gardens N., lias 5-7 leaflets 

 lanceolate and cut-pinnatifid, and the clusters of bluish flowers peduncled. 



79. LABIATJE, MINT FAMILY. 



Chiefly herbs, with aromatic herbage, square stems, opposite 

 simple leave?, more or less 2-lipped corolla (whence the name of 

 the order), either 4 didynamous or only 2 stamen?, 2-lobed stigma, 

 and at once distinguished from all the related families by the deeply 

 4-parted ovary (as if 4 ovaries around the base of a common style), 

 ripening into as many seed-like nutlets, or akenes, each containing 

 a single feed. Embryo usually tilling the seed. As in all these 

 families, there are 2 lobes belonging to the upper and 3 to the lower 

 lip of the corolla. Flowers from the axils of the leaves or bracts, 

 usually in cymose clusters, or running into terminal racemes or 

 spikes. 



1. Stamens 4, parallel and ascending, and projecting from a notch on Ihe upper 

 side of the, corolla. Nutlets reticulated and pitted, obliquely fixed by the inner 

 side near the b'tse. 



* Lobes of the corolla nearly equal and oblong, turned fonvard so that there seems 



to be no upper lip, thejilaments conspicuously projecting from the upper side. 



1. TEUCRIUM. Calyx 5-toothed. Corolla with a deep cleft between the two 



upper lobes. Cells of the anther confluent. 



2. TRICHOSTKMA. "Calyx 5-cleft in 2 lips, oblique. Filaments very long and 



slender, curved, coiled up in the bud. 



# # Lobes if the corolla equally spreading : filaments slightly projecting from the 



notdi between the 2 upper lubes. 



3. ISANTHUS. Catyx bell-shaped, equally 5-lobed, enlarging after flowering. 



Corolla only little longer than the calyx', bell-shaped, with 5 equal spreading 

 lobes. 



$ 2. Stamens 4, reclining on the lower lobe of the corolla, the outer or lower pair 

 lunger: anthers '2-celled. Co roll i -usually turned down or declining. Nutlets 

 smooth or sinoothith. fixed by their base, as in all the following divisions. 



4. OCIMUM. Calyx doflexed in fruit, 5-toothed, the upper tooth or lobe much 



broadest and sometimes wing-margined. Corolla short, the upper lip as it 

 were of 4 lobes, the lower of one entire flat or flattish declined lobe scarcely 

 longer than the upper. Filaments separate. 



