MINT FAMILY. 243 



Ii. nivea, from Brazil, has the pleasant-scented flowers white and nnchang- 

 ine ; or, in var. mutabilis, changing to bluish. 



L. involucr&ta, of West Inmes, has small obovate and prominently veiny 

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

 by the outer bracts. 



L. Sellowiima, 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. 



6. CALLICABFA. {From Greek {or beavtifvlfiuit.) M. early summer. 

 C. Americana, French Mulberkt. 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. 



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



V. Agnus-C&stUS, 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. indsa, of Northern China, barely hardy in gardeps N., has 5-7 leaflets 

 lanceolate and cut-pinnatifid, and the dusters of bluish flowers peduucled. 



79. LABIAT.ffl, MINT FAMILY. 



Chiefly herbs, with aromatic herbage, square stems, opposite 

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

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

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

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

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

 a single seed. Embryo usually filling 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. Stamem 4, parallel and ascending, and prelecting from a notch on (he tipper 

 side of the corolla. Ifutlets reticulated onof pitted, obliquely fixed by the inner 

 side near the base. 



« Lobes of the corolla nearly equal and oblong, fumed forward so that there seems 

 to be no upper lip, ike filaments conspicuously projecting from ffie upper side. 



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



upper lobes. Cells of the anther confluent. 



2. TEICHOSTEMA. Calyx 5-oleft in 2 lips, oblique. Filaments Very long and 



slender, curved, coiled up in the bud; 

 • * L<Aes of the coroUa equally spreading : filaments slightly projecting from die 

 notch between the 2 upper lubes. 

 8. ISANTHUS. Calyx bell-shaped, equally 6-lobed, enlarging after flowering. 

 Corolla only little longer than the calyx, bell-shaped, with 6 equal spreading 

 lobes. 



§ 2. Stamens 4, reclining on the lower lobe of the corolla, ike outer or tower pair 



hmger 1 anthers 2-celled. CoroUa usually turned down or declining. Nutlets 



smooth or smootiiish, fixed bylheir base, as in all thefaUomng divisions. 



i. OCIM0M. Calyx deflelted in fruit, 5-toothed, the upper tooth or lobe much 



broadest and sometimes wing-margined. Corolla snort, 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. 



