ROSE AND STANDLEY — GENUS TALINUM IN MEXICO. 



283 



Leaves flat or flattish. 



Leaves linear or linear-elliptical. 



Leaves 7 mm. long or less, comparatively thick; petals 



4 to 5 mm. long 9- T. oligospermum. 



Leaves 12 to 22 mm. long, thinner; petals 10 to 16 mm. 

 long. 

 Flowers clustered at ends of the branches; sepals 9 



or 10 mm. long .10. T. cymhosepalum. 



Flowers never clustered at the ends of the branches; 

 sepals 5 or 6 mm. long. 

 Plants 15 cm. high or less; pedicels bracteate 

 at or above the middle; leaves narrowly 

 linear; stems branched only at the base. . II . T. lineare. 

 Plants usually 40 to 50 cm. high; pedicels brac- 

 teate below the middle, usually near the 

 base; leaves wider, linear to linear-ellip- 

 tical; stems much branched 12. T. aurantiacum. 



Leaves oblanceolate, cuneate, obovate, or broadly elliptical. 

 Flowers axillary or in terminal simple racemes. 

 Flowers pink or red. 



Sepals long-attenuate, not exceeding the cap- 

 sule 13. T. attenuatum. 



Sepals oblong or ovate, acuminate, longer than 9 



the capsule 1-1 • T. confumm. 



Flowers white. 



Leaves comparatively large, obovate 15. T. (rkmgulare. 



Leaves much smaller, oblanceolate or cunei- 



f orra 10. T. diffusum. 



Flowers in terminal panicles. 



Flowers yellow; stems mostly reddish; leaves all 

 except the uppermost obtuse, becoming grad- 

 ually smaller above 17. T. chrysanthum. 



Flowers red; stems usually green; leaves acute, 

 suddenly much reduced near the base of the 

 inflorescence 18. T. panwulatum. 



1, Talinum greenmanii Harshberger, Bull. Torr. Club 24: 183. 1897. 

 Type locality: "Volcanic gravel, Sierra de Ajusco, Mexico." 



Six or 7 cm. high, from a thick, fleshy, tuberous root; stems only slightly developed, 

 simple, numerous from each root; leaves numerous, crowded, terete, 4 to 5 cm. long; 

 peduncles several from each stem, not exceeding the leaves, with 1 to 3 flowers; bracts 

 early deciduous; petals yellow, 5; stamens 7 or 8; capsule pale green, ovoid or sec- 

 tionally oblong, 6 mm. long, obtusely triquetrous. 



Specimens examined: 



Federal District: Sierra de Ajusco at 2,550 meters, August 31, 1896, C. G. 



Pringle 6472, type. 

 Tepic: In the Sierra Madre near Santa Teresa, August 12, 1897, /. N. Rose 2221. 

 Chihuahua: In the Sierra Madre, June 12 to July 29, 1899, E. W. Nelson 



6094; near Colonia Garcia, Sierra Madre, July 19, 1899, altitude 2,400 meters, 



Townsend & Barber 151. 



2. Talinum parvulum ep. nov. 



Cespitose from a thick, tuberous root, acaulescent, 2.5 cm. high or less; leaves terete, 

 about 1 cm. long, on slender petioles as long or longer; inflorescence cymose, with 2 

 to 4 flowers on each peduncle, not exceeding the leaves; petals yellow, about 3 mm. 

 63519°— 11 2 



