A REVISION OF THE GENUS HAMELIA 207 



Mexico is an important centre of distribution, with at least 

 eleven species ; seven species occur in the remaining portion of 

 Central America; seven in the West Indies; ten in Tropical South 

 America, of which two only are recorded for Brazil. 



Specierum Clavis. 



Flowers with relatively long pedicels, terminating the branches 

 of forking cymes. Leaves usually opposite, or sometimes 



4-nate, glabrous 1. H. chrysantha. 



Flowers sessile, subsessile, or but shortly pedicellate, seciind 

 upon the branches of forking cymes. 



Corolla 2-5 cm. or more in length (in H. magniloha barely 

 2"5 cm.), more or less widened above. 



Mature leaves glabrous, or slightly pubescent only on 

 the veins beneath. 



Calyx-lobes not less than 5 mm. long ... 2. Zf. calycosa. 

 Calyx-limb very shortly toothed. 



Corolla-lobes 8-9 mm. long, patent ... 3. H. magniloba. 

 Corolla-lobes seldom exceeding 3 mm., erect. 

 Leaves 20-25 cm. long; seeds distinctly pear- 

 shaped 4. H. grandiflora. 



Leaves rarely exceeding 12 cm. ; seeds not 

 pear-shaped. 



Berry subglobose, seeds 1 mm. and more 

 across, with fine reticulum and dull surface 



5. H. cuprcea. 

 Berry oblong, seeds not exceeding \ mm., 

 with coarse reticulum and glistening surface 



6. U. ventricosa. 

 Mature leaves with manifest indumentum, between as 

 well as upon the veins beneath. 

 Leaves ovate, 6-5-9 cm. x 4-5-5 cm., puberulous 



above 7. -H- liypomalaca. 



Leaves elliptic-oblong, 10-12-5 cm. x 4-5-5 cm., 



glabrous above 8. H. xorullensis. 



Corolla rarely exceeding 2 cm. in length. 

 Leaves opposite. 



Leaves glabrous. 



Corolla campanulate above 9. H. lutea. 



Corolla tubular throughout. 



Leaves elhptic-lanceolate, flowers mostly ex- 

 ceeding 1 cm. in length. 



Leaves 5-6 cm. long 10. H. axillaris. 



Leaves 15-24 cm. long 11. H.magnifolia. 



Leaves almost orbicular, flowers mostly less 



than 1 cm. in length 12. H. breviflora. 



Leaves not glabrous. 



Coroha and fruit glabrate 13. H. rostrata. 



CoroHa and fruit clothed with dense yellowish 



hairs 14. H. xerocarpa. 



Leaves whorled. 



Stamens reaching, or almost reaching, the mouth of 

 the corolla, often exceeding it. 



Calyx-teeth relatively long, usually revolute. 



Corolla-tube glabrous 15. H. oyata. 



Corolla-tubo hairy on the outside... 16. H. lioviroscv. 

 Calyx-teeth very short, deltoid, usually adpressed 

 to corolla base. 



