STANDLEY TREES AND SHRUBS OF MEXICO 1353 



4. RONDELETIA L. Sp. PL 172. 1753. 

 Reference: Standley, N. Amer. Fl. 32: 44-86. 1918. 



Shrubs or small trees; flowers in terminal or axillary cymes, corymbs, or pan- 

 icles; calyx 4 or 5-lobate; corolla funnelform or salverform, the tube slender, the 

 limb 4 or 5-lobate, the lobes imbricate; fruit capsular, 2-celled, loculicidally or 

 septicidally bivalvate, many-seeded; seeds often winged or appendaged. 



Inflorescence wholly axillarj' 1. R. scabra. 



Inflorescence terminal, sometimes also axillary. 

 Corolla densely yellow-barbate in the throat. 

 Corolla glabrous outside. 



Calyx lobes foliaceous, several times as long as the tube; leaves setose- 

 pilose beneath 2. R. suflfrutescens. 



Calyx lobes minute, shorter than the tube; leaves glabrous beneath except 



for tufts of hairs in the axils of the nerves 3. R. ligustroides. 



Corolla pubescent outside. 



Branches acutely quadrangular; petioles 5 to 13 mm. long; leaves usually 



acute at base 4. R. stenosiphon. 



Branches terete or subangulate; petioles very short; leaves obtuse to 

 cordate at base. 



Stipules triangular-subulate, 4 to 6 mm. long 5. R. gratissima. 



Stipules mostly oblong, foliaceous, 10 mm. long or longer, usually 

 obtuse. 



Leaves sparsely strigose beneath 6. R. intermedia. 



Leaves densel}^ soft-pilose beneath. 



Leaves broadly ovate or ovate-oval, usually subcordate at base; 



corolla tube 12 mm. long or less 7. R. amoena. 



Leaves elliptic or lance-elliptic, obtuse at base; corolla tube 15 mm. 



long 8. R. langlassei. 



Corolla usually naked in the throat, never yellow-barbate. 

 Inflorescence an elongate spikelike panicle. 



Corolla variously pubescent outside but never tomentose. 



Panicles shorter than the leaves, partly axillary; leaves glabrous. 



9. R. heteranthera. 

 Panicles longer than the leaves, all terminal; leaves pilose-strigose 



beneath 10. R. capitellata. 



Corolla arachnoid-tomentose outside. 



Leaves somewhat tomentose beneath when j^oung but soon glabrate. 



11. R. septicidalis. 

 Leaves densely tomentose beneath even in age. 

 Corolla tube 12 to 15 mm. long. 



Secondary veins of the leaves obsolete; tomentum of the lower 

 surface of the leaves white, very closely appressed. 



12. R. laniflora. 

 Secondary veins prominent; tomentum loose, fulvous. 



13. R. bourgaei. 

 Corolla tube 4 to 10 mm. long. 



Leaves long-pilose beneath along the nerves; corolla tube 8 to 



10 mm. long 14. R. villosa. 



Leaves not pilose beneath; corolla tube 4 to 8 mm. long. 



15. R. buddleoides. 

 Inflorescence various but never an elongate spikelike panicle. 

 Corolla not arachnoid-tomentose outside. 



Corolla pubescent outside 16. R. deamii. 



