198 DESCRIPTIVE BOTANY. 



sessile, white, in terminal, compound, dichotomous panicles, bracts small. 

 Fruit lens-shaped, in 4-celled drupes. 



There are three species of this magnificent tree. 



Geography. — The geographical home of the Tectona is tropical. One 

 species is found in the East Indies, another in Burmah, and the third in the 

 Philippines. 



Etijinologi]. — The generic name, Tectona, was altered from Tekka, the 

 native name, whose signification is unknown. Grandis, the specific name, is 

 the Latin for large, or noble, and is due to its magnificent size. 



Use. — The teak is used in India in all structures where strength and dura- 

 bility are desired. It has been called the oak of the East. England has 

 constructed some of her best ships of teak, some of which were built in India, 

 and others in England, the timber having been taken home. 



The leaf yields a red dye, and is also charged with an oil, the extraction of 

 which forms an important industry. The oil is used for polishing and var- 

 nishing purposes. 



Order XLII. LABIAT-^]. 



Flowers irregular, rarely regular, solitary or in pairs, or clustered 

 in cymes in the axils of leaves or bracts, scattered along the extremi- 

 ties of the stems, or in densely crowded spikes ; calyx persistent ; 

 sepals 5, connate, mostly lipped ; corolla with united petals, h}^)ogy- 

 nous, tube occasionally twisted, limb 4-5-lobed. imbricated in the 

 bud, usually 2-lipped, upper lip entire or notched, lower 3-lobed, 

 sometimes 1-lipped and deeply cleft, sometimes bell-shaped or funnel- 

 shaped, with four equal lobes and nearly equal stamens ; stamens on 

 corolla-tube usually 4, didynamous ; ovary free ; style simple, rising 

 from the base of the ovarian lobes, Jr-lobed ; stigma usually forked. 

 Fruit 4 akene-like lobes or nutlets, free or in pairs. Stems square ; 

 leaves opposite or whorled, exstipulate ; subwoody and herbaceous 

 plants, covered with glands containing an odoriferous volatile oil. 



Xo. of genera, 136 ; species, 2,600 ; cosmopolitan. 



LAVANDULA, L. Calyx spindle-shaped, 13-15 striate, 5-toothed, 

 upper tooth longest ; corolla-tube exserted, upper lip 2-lobed, lower 

 one 3-lobed; stamens shorter than the corolla-tube; anthers 1-celled 

 by confluence. Flowers small, spicate. Perennial herb. 



1. L. spica, L. (Lavender.) Stem woody at the base, 15 to 20 inches high 

 in a natural state, but reaching 5 feet under cultivation, branching near the 

 ground. Leaves crowded about the base of the branches, whitish downy, 

 oblanceolate, tapering to the base, sessile, edges revolute, leaves on the 

 branches and upper part of the stem linear-lanceolate, uppermost ones shorter 

 than the calyx bracts, and awl-shaped. Flowers in an interrupted spike, lilac- 

 colored. July. 



Var. alba, W. Has white flowers, otherwise as above. 

 Var. latifolia, W. Has broader leaves 



2. L. vera, DC, and L. stoechas, L. Were formerly in use, but are not used 

 at the present day. 



There are some twenty species in all ; the above are the important ones. 



