STANDLEY TKEES AND SHKUBS OF MEXICO. 1229 



Plants frutescent, canescent-sericeous or tomentose ; leaves petiolate, mostly 

 ovate or elliptic, 5 to 12 mm. long ; calyx lobes liuear-lanceolate ; corolla 

 purplish, 6 to 7 mm. broad. " Hierba de la virgen " (Coahuila, San Luis 

 Potosf). 



The plant is employed locally as a remedy for dysentery. 



5, Coldenia mexicana A. Gray, Proc. Amer. Acad. 18: 119. 1883. 

 Coahuila ; type from Saltillo. 



Plants prostrate, fruticose, setose-hispid and canescent-tomentose ; leaves 

 ovate to broadly elliptic ; flowers sessile ; calyx lobes narrowly linear ; co- 

 rolla pink, 6 mm. long. 



6. Coldenia tomentosa A. Gray, Proc. Amer. Acad. 18: 120. 1883. 

 Coahuila and Nuevo Leon ; type from the Sierra Madre south of Saltillo, 



Coahuila. 



Plants fruticose, setose-hispid and canescent-hispid ; leaves lance-ovate, revo- 

 lute ; coi'olla purple. 



5. TOUBNEFORTIA L. Sp. PI. 140. 1753. 



Shrubs or small trees, often scandent ; leaves entire ; flowers small, in scor- 

 pioid cymose spikes or racemes ; calyx 5-parted ; corolla salverform, usually 

 white, the throat naked ; stamens included ; fruit drupaceous, small, contain- 

 ing 4 nutlets. 



Corolla lobes linear to triangular, acute or acuminate. 



Leaves glabroxis beneath or sparsely scabrous or scaberulous. 



Calyx equaling the corolla tube 1. T. umbellata. 



Calyx much shorter than the corolla tube. 



Lobes of the corolla as long as the tube ; fruit sericeous 4. T. potosina. 



Lobes much shorter than the tube; fruit glabrous or glabrate. 



Fruit globose-ovoid, entire 2. T. glabra. 



Fruit globose, 4-lobate 3. T. peruviana. 



Leaves densely sericeous or pubescent beneath. 



Corolla lobes almost filiform, equaling the tube 4. T. potosina. 



Corolla lobes linear or broader, shorter than the tube. 



Corolla tube 2.5 to 3 mm. long 5. T. volubilis. 



Corolla tube 5 to 8 mm. long. 



Tube about 5 mm. long 6. T, nelsoni. 



Tube 8 mm. long 7. T. caeciliana. 



Corolla lobes broad, obtuse. 



Leaves linear or oblong-linear, very obtuse 8. T. gnaphalodes. 



Leaves lanceolate to broadly ovate, usually acute or acuminate. 



Calyx lobes equaling the corolla, obtuse 9. T. calycina. 



Calyx lobes shorter than the corolla. 

 Cymes dense, composed of 2 to 4 short spikes ; leaves densely pubescent 

 beneath, at least when young, often sessile. 

 Leaves mostly obtuse, crispate, the pubescence soft to the touch. 



10. T. mollis. 

 Leaves acute or acuminate, not crispate, the pubescence harsh. 



11. T. hartwegiana. 

 Cymes usually lax, composed of numerous spikes, these ftften elongate; 



leaves often glabrate, petiolate. 

 Leaves usually densely sericeous or pubescent beneath ; calyx com- 

 monly half as long as the corolla tube or shorter. 



12. T. Mrsutissima. 

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