STANDLEl- — TREES AND SHRUBS OF MEXICO 1331 



Scandant shrub, the fleshy branches reddish-villous above; leaves short- 

 petiolate, obliquely oblong or lanceolate, 5 to 10 cm. long, acute, very oblique at 

 base, sericeous or somewhat tomentose, especially beneath, often tinged with red; 

 flowers slender-pedicellate; calyx red, the lobes lanceolate or ovate, acuminate, 

 entire or remotely dentate, rounded at base, villosulous; corolla 5.5 to 6 cm. long 

 villous; fruit globose, white. 



152. ACAIfTHACEAE. Acanthus Family. 



Shrubs or herbs, rarely small trees, the pubescence usually of simple hairs; 

 leaves opposite, mostly entire, commonly marked with linear cystoliths, estipu- 

 late; flowers perfect, small or large, usually irregular, bracteate and bibracteolate; 

 calyx inferior, the 5 (rarely 4) segments usually united for less than half their 

 length, often nearly free; corolla gamopetalous, the tube slender or broad, the 

 limb subequally 5-loljate or more commonly bilabiate; perfect stamens 4 or 2, 

 attached to the corolla tube, the fifth stamen (or 2 of the othei's also) sometimes 

 represented by staminodia; stj^le simple, usuallj^ bilobate at apex; fruit capsular, 

 usually stipitate, 2-celled, elastically dehiscent; seeds 2 or several. 



A large number of herbaceous plants of the family, some of them belonging to- 

 genera not listed here, occur in Mexico. 

 Fertile stamens 4. 



Corolla limb with subequal lobes. 



Flowers in large dense terminal spikes furnished with large bracts. 



1. BARLEBIA. 

 Flowers not spicate. 



Anthers 1-celled 2. HOLOGRAPHIS. 



Anthers 2-celled. 



Calyx lobes narrow, acute or acuminate, not coriaceous. _3. RUELLIA. 



Calyx lobes broad, obtuse, coriaceous 4. BRAVAISIA. 



Corolla limb bilabiate. 



Flowers in very dense spikes, subtended by large bracts; corolla tube long 



and slender 5, APHELANDBA. 



Flowers in small interrupted spikes, the bracts small and inconspicuous; 



corolla tube short, ampliate 6. BEBGINIA. 



Fertile stamens 2. 



Calyx with 3 segments 7. LOUTERIDIUM. 



Calyx with 4 or 5 segments. 



Anther cells parallel, equal, both inserted at the same height upon the 

 filamehu. 

 Staminodia (sterile stamens) present. 



Flowers in axillary few-flowered cymes 8. CHILERANTHEMUM. 



Flowers in terminal, simple or paniculate racemes. 



9. ODONTONEMA, 

 Staminodia none. 



Corolla lobes widely spreading, longer than the tube; flowers small. 



10. CARLOWRIGHTIA. 

 Corolla lobes erect-recurved, often shorter than the tube; flowers large. 



11. ANISACANTHUS. 

 Anther cells unequal, inserted at different heights. 



Calyx tubular, 5-dentate 12. NEOHALLIA. 



Calyx deeph' 5-lobate or 5-parted. 



Calyx lobes broad, foliaceous 13. TABASCINA. 



Calyx lobes usualh^ linear or subulate. 



Anther cefls not mucronate at base... 14. JACOBINIA. 



