STANDLEY TKEES AND SHRUBS OF MEXICO. 1235 



corolla gamopetalous, the tube cylindric or ampliate above, often curved, the 

 limb 4 or 5-lobate, often bilabiate ; perfect stamens 4 or 2, attached to the 

 corolla and alternate with the lobes ; style simple, entire or shortly bilobate ; 

 fruit drupaceous or subcapsular, 2 or 4-celled. 



Several genera are represented in Mexico only by herbaceous species. 



Leaves digitately compound 1. VITEX. 



Leaves simple. 



Flowers in heads, spikes, or racemes, rarely solitary in the leaf axils. 



Fruit with 4 stout spines at apex 2. GKINIA. 



Fruit without spines. 

 Flowers racemose. 



Calyx deeply lobate, strongly accrescent, blue ; fruit dry__3. PETREA. 

 Calyx shallowly dentate, not blue; fruit fleshy. 



Stigma bilobate ; drupe containing 2 2-seeded nutlets. 



4. CITHAREXYLUM. 

 Stigma 4-lobate; drupe containing 4 2-seeded nutlets. 



5. DURANTA, 

 Flowers spicate or capitate. 



Stamens 2 ; spikes terminal 6, VALERIANOIDES. 



Stamens 4 ; spikes or heads axillary and terminal. 



Fruit dry 7. LIPPIA. 



Fruit fleshy 8. LANTANA. 



Flowers in cymes or panicles. 



Fruit capsular ; cymes very dense, headlike 9. AVICENNIA. 



Fruit drupaceous ; cymes loose and open. 

 Nutlets of the fruit united. 



Nutlets united to form a single stone 10. CORNTJTL&.. 



Nutlets cohering in pairs 11. CLERODEITDRUM. 



Nutlets distinct. 



Nutlet 1 12. PETITIA. 



Nutlets 4. 



Branches of the style short, obtuse 13. CALLICARPA. 



Branches of the style subulate 14. AEGIPHILA. 



1. VITEX L. Sp. PI. 638. 1753. 



Shrubs or trees ; leaves opposite, digitately compound, the leaflets entire ; 

 cymes axillary or in terminal panicles ; calyx campanulate, 5-dentate ; co- 

 rolla tube short, the limb oblique, somewhat bilabiate, 5-lobate ; stamens 4 ; 

 fruit drupaceous. 



Leaflets usually 3 ; corolla densely sericeous-pilose outside 1. V. mollis. 



Leaflets mostly 5 ; corolla sparsely puberulent or glabrate. 

 Leaflets densely tomentulose beneath. 



Corolla about 12 mm. long, the throat villous 2. V. pyramidata. 



Corolla about 8 mm. long, the throat not villous 3. V. gaumeri. 



Leaflets glabrous beneath or nearly so 4. V. hemsleyi. 



1. Vitex mollis H. B. K. Nov. Gen. & Sp. 2: 245. 1817. 



Vitex lasiophylla Benth. Bot Voy. Sulph. 155. 1844. 



Baja California to Chihuahua, Morelos, and Oaxaca ; type from Chilpan- 

 cingo, Guerrero. 



Large or medium-sized tree, 18 meters high or less, the bark grayish or 

 brown, shredded ; leaves long-petiolate, the leaflets normally 3, rarely 5, oblong 

 to oval-oblong, 12 cm. long or less, obtuse or rounded at apex, densely velu- 



