Flora of the Malayan Peninsula. 699 



Family XCI.— LABIATE. 

 [By D. Peain.] 



Herbs, less often shrubs, usually beset with oil-glands. Stevi usually 

 d-angied. Leaves opposite or whorled ; exstipellate. Floivers irregular, 

 solitary, 2-nate or fascicled, axillary or in centrifugal spicate cymes 

 which by union in pairs form false whorls. Calyx persistent, nearly 

 regular, or variously 4- to 5-cleft, or 2-lipped. Corolla gamopetalous, 

 hypogynous ; limb 4- to 5-lobed, or 2-lipped and personate, the lobes 

 imbricate in bud. Stamens attached to the corolla-tube, usually 4 didy- 

 namous, sometimes the upper pair imperfect ; anther-cells divaricate or 

 parallel, sometimes disjoined, sometimes confluent. Dish usually pro- 

 minent, regular or irregular. Ovary free, composed of two 2-celled carpels, 

 the cells of which are also free; style simple, inserted between the lobes 

 of the ovary; the stigma usually 2-lobed, its arms often unequal ; ovules 

 in each cell solitary, erect, anatropous. Fruit of 4 dry or rarely fleshy 

 1-seeded nutlets, rarely one or more of these abortive, situated at the 

 base of the calyx ; scar of attachment usually basal, small, occasionally 

 lateral or sublateral and larger. Seeds small, erect, without albumen, 

 or albumen very scanty; radicle inferior. — Disteib. Species about 

 2800, mainly in North Temperate regions. 



Stamens 4, declinate : — 

 Lowest corolla-lobe patent, flat or slightly concave, wide- 

 based ; calyx-limb 2-lipped ; upper tooth much wider than 

 the others ; filaments free : — 



Corolla-tube very short, not or slightly exserted ; stigma 



2-M . . . . . . . . . . 1. OciiiuM. 



Corolla-tube long, usually far exserted ; stigma entire or 



subentire . . . . . . . . . . 2. Okthosiphon. 



Lowest corolla-lobe deflexed, saccate or cymbiform, narrow- 

 based : — 



Calyx-limb uniform ; teeth 5, subequal ; lowest corolla-lobe 



thick-edged, deeply saccate, not much longer than the 



others; filaments free .. .. .. ..3. Hyptis. 



Calyx-limb 2-lipped ; upper tooth often (not always) wider 



than the others ; lowest corolla-lobe cymbiform, much 



longer than the others, its margin not thickened : — 

 Filaments free beyond point of insertion on corolla-tube 4. Plectranthus. 

 Filaments connate in a sheath round the style . . 5. Coleus. 



Stamens not declinate ; filaments free : — 



Stamens 4, erect or spreading, equal or subequal ; calyx- 

 limb uniform ; teeth o, subequal ; corolla-lobes 4, flat, 

 subequal : — 



