ORDER 91. LABIATE. 237 



C. Americana L. Pubescent ; Ivs. ovate, acuminate at each end, crenate-deutate, 

 smooth above ; clusters shorter than the petioles ; fruit forming dense verticils Light 

 soils, S. Shrub much branched, 3 6f, with purple flowers and fruit. 



5. LANTANA, L. Cal. minute, obsoletely 4-tootked. Corolla funnel- 

 form, the tube long-exserted, limb oblique, upper lip bifid or entire, lower" 

 trifid. Sta. 4, didynamous, included. Drupe fleshy, double, the parts sep- 

 arable, 1-seeded. J> 3 6f. Tropical, with square stems, opposite petio- 

 late leaves, and capitate, handsome flowers, often fragrant. 



* Corollas white or lilac, not becoming yellow or scarlet Nos. 1 3 



* Corollas white or yellow, changing to saffron, scarlet, crimson, &c Nos. 4, 5 



1 Li. NIVEA. Branches with reversed prickles ; Ivs. ovate to elliptic, crenate-serrate, as 



long as the peduncles ; no involucre ; flowers white, turning to blue. Brazil. 



2 L. SELLOVVIANA. Branches strigous ; Ivs. rhombic to oblong, coarse-serrate, shorter 



than the peduncles ; heads some involucrate ; flowers reddish lilac. Brazil. 



3 li involucrata L. Whitish-downy ; Ivs. obovate to roundish, crenulate, as long 



as the peduncles ; heads involucrate with the outer ovate bracts, lilac. S. Fla. 



4 li. MIXTA. Prickles reversed orO; Ivs. ovate, crenate, abrupt at base, shorter than 



the peduncles ; bracts as long as the corollas, which are white at first, then changing 

 to yellow, then orange, and lastly red. Brazil. 



5 L. Camara L. Often prickly ; Ivs. as in No. 4, but equalling the peduncles ; bracts 



half as long as the corollas, which are successively yellow, orange, red. Ga., Fla. 



6. VITEX, L. CHASTE-TREE. Calyx 5-toothed. Cor. cup-shaped, 5- 

 lobed, somewhat 2-lipped. Stamens 4, unequal, exserted. Drupe entire, 4- 

 celled, 4-seeded. J) With opposite, digitate leaves and paniculate cymes. 



1 V. AGNUS-CASTUS. Leaflets 5 or 7. lanceolate, entire, pointed both ways ; panicles 



white-tomentous, terminal, interrupted ; corolla purplish. Hardy. S. 



2 V. NEOUNDO. Leaflets 3 or 5, oblong, serrate, acuminate. Mauritius. 



3 V. INCISA. Leaflets 5 or 7, incisely pinnatifid, acuminate. China. 



ORDER XCI. LABIATE. LABIATE PLANTS. 



Herbs with square stems, and opposite, aromatic, exstipulate leaves. 

 Flowers axillary, in verticillasters, sometimes as if spiked or in heads. Co- 

 rolla labiate (rarely regular), upper lip external in the bud. Stamens 4, 

 didynamous, or only 2. Ovary free, deeply 4-lobed, the single style arising 

 from between the lobes. Fruit composed of 4 (or by abortion fewer) sep- 

 arable 1-seeded nuts or achenia. Figs. 23, 69, 96, 281, 292, 318, 384. 



Stamens 2, perfect, p ascending beneath the galea ; anthers 1-celled. (Tribe IV.) 

 p ascending through a cleft in the galea ; anthers 2-celled . . . (fe) 

 p exserted, distant ; anthers 2-celled. ..('I) 

 | Stamens 4, perfect, q all declined toward the lower lip. (Tribe I.) 



q erect, or ascending toward the upper lip. . .(2) 

 2 Stamens of equal length, corolla almost regular, 4-5-lobed...(*c) 



2 Stamens, the upper pair longer than the lower (outer), and calyx 13-15- veined. (Trio* V.) 

 Stamens, the lower pair longer than the upper (interior) pair. . .(3) 

 3 Stamens divergent, apart, mostly straight and exserted. . .(e) 

 3 Stamens parallel, ascending and long-exserted from the upper side... (6) 

 3 Stamens parallel, ascending in pairs beneath the upper lip. . .(4) 

 4 Calyx 13-veined, 5-toothed, and somewhat 2-lipped. ..(/) 

 4 Calyx 5-10-veined, or irregularly netted. . .(5) 



