284 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



long; sepals rather obtuse, soon deciduous; capsule 3 mm. long, obtusely triquetrous; 

 seeds very small, smooth. 



It might be possible to confuse this with T. greenmanii, but it is a much smaller 

 plant, acaulescent, and with different leaves, and the seeds are not half as large as in 

 that species. 



Type U. S. National Herbarium no. 571476, collected at Otinapa, Durango, July 25 

 to August 5, 1906, Dr. Edward Palmer 451. 



3. Talinum palmeri sp. no v. Plate 44 

 Perennial from a stout, thickened root, acaulescent, 40 cm. high or less; leaves 



terete, acutish, 8 or 9 cm. long or less, scarcely attenuate toward their bases; flowers 

 numerous, 15 mm. in diameter; petals white, 8 or 10 mm. long; sepals obtuse, almost 

 orbicular, 3 mm. long; stamens 5; capsule about 5 mm. long, oblong in section and 

 triquetrous; seeds grayish, rugulose. 



Its large white flowers distinguish this plant from all the related species, and the 

 size of the plant is greater than in other members of this group. 



Type U. S. National Herbarium no. 571462, collected at Otinapa, Durango, July 25 

 to August 5, 1906, Dr. Edward Palmer 436. The species has been grown in the 

 greenhouse in Washington from plants sent by Doctor Palmer at the time he col- 

 lected the type specimens. 



This species is dedicated to Dr. Edward Palmer, who has collected the type material 



of three of the new species proposed, as well as many of the other specimens cited. 



Besides the type, he collected the same plant in the vicinity of Durango between 



April and November of 1896 (no. 303). 



Explanation of Plate 44.— From a specimen grown at Washington, sent from Tepehuanes, Durango, 

 by Dr. Edward Talmer in I90C. 



4. Talinum brevicaule S. Wats. Proc. Amer. Acad. 21: 446. 1886. 

 Type locality, "In the Santa Eulalia Mountains, Chihuahua." 



A low perennial, 8 cm. high or less, from a large, thick, woody root; sterna stjutand 

 woody, poorly developed and little branched; leaves terete, rather stout, 12 'jHIfTong 

 or less, acutish; peduncles slender, only slightly longer than the leaves, eajh bearing 

 1 to 3 flowers, these on pedicels 8 mm. long; sepals lanceolate, acute, 7 mm. long; 

 petals purplish red, 12 mm. long; capsule not seen. 

 Specimens examined: 



Chihuahua: Santa Eulalia Mountains, May 20, 1885, C. G. Pringle 26 (Gray Herba- 

 rium, type). 



Through the kindness of Dr. B. L. Robinson we have been permitted to examine 

 the type. It consists of a single plant, perhaps the only one collected, for there is no 

 material of this collection in the National Herbarium. Talinum brevicaule has larger 

 flowers than any of the terete-leaved members of the genus. 



5. Talinum napiforme DC. Prodr. 3 : 357. 1828. 

 Claytonia tuberosa Moc. & Sesse in DC. Prodr. loc. cit. 

 Type locality, "In Mexico." 



Eight to 15 cm. high from a thick, tuberous root, almost acaulescent, the stems 

 being poorly developed, several of them from each root; leaves terete, 4 to 8 cm. long, 

 rather stout, erect; peduncles numerous, slender, cymosely much branched above, 

 flowers numerous, on pedicels 7 to 15 mm. long, with white petals about 7 mm. long'; 

 sepals broadly ovate, acutish, 4 mm. long; capsules 5 mm. high, pointed at the apex,' 

 obtusely triquetrous. 



Specimens examined: 



Federal District: Tlalpam, Valley of Mexico, August 20, 1896 /. W. Harsh- 

 berger 166. 



The specific name, referring to the shape of the root, is very appropriate, but would 

 apply equally well to several other members of the genus. 



