384 
LXXV. LABIATJE 
* * * Lower lip of corolla 3-lobed, but the lateral 
lobes very small or wanting . . . . . .24. Lamium. 
C. Corolla irregular, limb 1 -lipped, upper lip wanting. 
Flowers in pairs, forming erect racemes. Lip of corolla 
5-lobed ......... 28. Teucrium. 
1. ACROCEPHALUS. From the Greek acros, the top, and 
cephale, a head, referring to the terminal inflorescence. — Tropical 
and subtropical regions in Asia and Africa. 
*Acrocephalus capitatus, Benth. ; FI. Br. Ind. iv. 611. An 
annual, pubescent herb ; stems 6-12 in., decumbent or ascending, 
usually branching from near the base. Leaves ovate or lanceolate, 
i-l in., coarsely toothed, narrowed into a nearly sessile base. 
Flowers small, pale purple, crowded in stalked, terminal, globose 
heads about \ in. diam. ; floral leaves usually spreading. Calyx 
ovoid in flowering time, elongated and tubular in fruit, 2-lipped ; 
upper lip flat, entire, lower shorter, 4-toothed. Corolla nearly 
regular ; tube longer than the calyx ; limb 5-lobed, lobes nearly 
equal. Stamens 4, nearly equal, included. 
Throughout India, ascending to 5000 ft., common in moist situations ; 
flowers during the cold season. 
2. PLECTRANTHUS. From the Greek pledron , a spur, and 
anthos, a flower, referring to the unequally dilated base of the 
corolla-tube in some species. — Tropical and subtropical regions of 
the Old World. 
Erect shrubs or undershrubs. Leaves opposite or whorled, 
stalked or the upper sessile. Flowers about J in. long, in small 
cymes forming racemes or panicles. Calyx bell-shaped in 
flowering time, enlarging and becoming 2 -lipped or tubular in 
fruit ; teeth 5, nearly equal or very unequal. Corolla- tube usually 
longer than the calyx ; limb 2-lipped, upper lip short, broad, 
recurved, 3- or 4-lobed, lower longer, boat-shaped, entire. 
Stamens 4, in unequal pairs, lying along the lower lip of the 
corolla ; filaments free. 
Leaves opposite. 
Calyx -teeth equal or nearly so at least in flower. 
Lower surface of leaves glabrous or nearly so. 
Corolla-tube straight. 
Corolla white, mid-lobes of upper lip spotted 
with purple . . . . . .1. P. Gerar dianus. 
Corolla white . . . . . . 2. P. striatus. 
Corolla-tube abruptly decurved . . . 3. P. Coetsa. 
Lower surface of leaves white-tomentose . . 4. P. rugosus. 
Calyx-teeth very unequal, uppermost ovate, obtuse, 
others narrowly lanceolate, acute . . 6. P. incanus. 
Leaves in whorls of three . . . . . 5. P. ternijolius. 
