184 



glabrous; stamens 5, glabrous, filaments united to above the middle; style single, 

 glabrous, much longer than the stamens; stigma club-shaped; ovary hairy, 1-eelled, 

 2-ovuled. 



Collected by Dr. Edward Palmer near Culiacan, October 25 to November 18, 1891 

 (No. 1793). 



aa. Leaves not so thin, not acuminate nor sharply serrate; never glahrate. 



b. Low, rather delicate shrubs or herbs; leaves small; flowers small. 



c. Calyx tube twice as long as the sepals. 



Waltheria preslii Walp. Report. 1 :340. 1842. IValtheria rotundifolia Presl, Reliq. 

 Haenk. 2:151. 1836. Not Schrank, 1828. 



Very common on the sea beach, often covering large surfaces with its long pros- 

 trate stems; flowers yellow. Collected by Dr. E. Palmer near Acapulco, February, 

 1895 (No. 502). 



The type of W. rotundifolia was collected at Acapulco by Haenke many years ago, 

 but has not since been collected till now. 



cc. Calyx tube no longer than the sepals. 

 d. Filaments united to the top. 



Waltheria americaua L. Sp. PI. 2 : 673. 1753. 



Collected by J. N. Rose at Mazatlan, June 17 to 19, 1897 (No. 1376) ami at Acap- 

 oneta, Topic, June 23 to 30 (No. 3130). 



A common tropical species. 

 Waltheria detousa Gray, PI. Wright, 2 : 24. 1853. 



Collected by J. N. Rose near San Juan Capistrano, Zacatecas, August 22, 18.07 

 (No. 3448). 



dd. Filaments not united at the top. 



Waltheria hirsuta Presl, Reliq. Haenk. 2 : 152. 1836. 



This species was collected by Haenke somewhere in western Mexico, but the exact 

 locality is not given. I have not been able to refer any of our Mexican material to 

 it. The species is described as having the leaves ovate, cordate, acute, and 5-nerved, 

 and the flowers purple, 



Waltheria acapulcensis Rose, sp. nov. 



Apparently a low shrub; branches slender, purplish, stellate-pubescent; upper 

 leaves somewhat elliptical, obtuse, rounded at base, some of the lower ones cordate, 

 2.5 to 5 cm. long, stellate above, paler and more densely stellate beneath ; flowers 

 in sessile or shortly pedunculate clusters; calyx 3 mm. high; .sepals equal to the 

 tube, acute; petals yellow, oblanceolate, obtuse, .tapering at base iuto a slender 

 claw; stamens united below for about one-fourth their length. 



Collected by Dr. E. Palmer near Acapulco, 1894-95 (No. 218). 



Dr. Palmer states that the species is very common in the canyons. 



bb. Tall coarse shrubs ; leaves large; flowers large. 

 e. Filaments united to the top. 

 Waltheria brevipes Turcz. Bull. Soc. Nat. Mosc. 31, pt. 1 : 213. 1858. 



Shrub 2.4 to 7.5 dm. high. Calyx 6 mm. long, hairy without; lobes half the length 

 of tube; filaments united to the top; style long and hairy; capsule without opercu- 

 lum. Collected by E. W. Nelson in dry ground in clearings about the outskirts of 

 Tux tepee, Oaxaca, April 9, 1894 (No. 362). 



The type locality is "San Pedro Nolasco." We have nothing like Mr. Nelson's 

 plant in the herbarium. It very closely resembles in habit, foliage, and inflorescence 

 Mr. Charles L. Smith's No. 1087 from isthmus of Tchuantepec, but has a different 

 calyx and stamen tube. 



