412 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



1. Hesperonia cedrosen3is Standley, Contr. Xat. Herb. 12: 362.1909. 



Type locality, "Cedros Island, Lower California." Type collected April 3, 1897, 

 by T. S. Brandegee. 



Specimens examined: 



Baja California: San Benito Island, 1889, Lieutenant Pond 23; Cedros Island, 

 March, 1889, Palmer 737; same locality, February, 1889, Palmer; San Quen- 

 tin Bay, January, 1889, Palmer 640; Cedros Island, 1911, Rose 95. 

 This is easily distinguishable from all other species of the genus by its peculiar 

 pubescence. 



2. Hesperonia heimerlii Standley, sp. nov. 



Stems stout, glaucous, glabrous, tortuous, much swollen at the nodes, with many 

 divaricate branches; leaf blades deltoid-ovate, the largest 35 mm. long and 30 mm. 

 wide, most of them smaller, thick and fleshy, cordate at the base, obtuse or acutish, 

 usually glabrous but some of the uppermost glandular-puberulent; petioles half as 

 long as the blades or those of the upper ones much shorter; involucres numerous, 

 short-ped uncled in the axils of the leaves or congested at the ends of the branches, 

 6 mm. high, cleft halfway to the base, the lobes triangular, densely glandular- 

 pubescent; perianth 10 mm. long or less; fruit glabrous, spherical or slightly com- 

 pressed vertically, 2.5 to 3 mm. in diameter, dark brown. 



Type in the U. S. National Herbarium, no. 22626, collected by Dr. Edward Palmer 

 at the south end of Guadalupe Island, Baja California, March 30, 1889 (no. 886). 

 Additional material was collected by Dr. F. Franceschi on the same island in 1893, 

 and by J. N. Rose in 1911 (no. 21). 



The form of the fruit places this plant near H. cedrosensis, but the pubescence is 

 very different. The specimens in the National Herbarium were labeled as a new 

 species of Mirabiiis by Doctor Heimerl. 



3. Hesperonia tenuiloba (S. Wats.) Standley, Contr. Nat. Herb. 12: 363. 1909. 

 Mirabiiis tenuiloba S. Wits. Proc. Amer. Acad. 17: 375. 1882. 



Type locality, "San Bernardino County, California." Type collected by W. G. 

 Wright in 1880. 



Specimens examined: 



Baja California: Signal Mountain, Colorado Desert, 1901, Brandegee; pass in 

 Cucopa Mountains, April 7, 1905, MacDougal 170; base of Cucopa Moun- 

 tains, April 5, 1905, MacDougal 125. 



4. Hesperonia laevis (Benth.) Standley, Contr. Nat. Herb. 12: 363. 1909. 

 Oxybaphus laevis Benth. Bot. Voy. Sulph. 44. 1844. 



Mirabiiis laevis Curran, Proc. Calif. Acad. II. 1: 235. 1889. 



Quamoclidion laeve Rydb. Bull. Torrey Club 29: 687. 1902, as to name, not material. 

 Type locality, "Bay of Magdalena," Baja California. 

 Specimens examined: 



Baja California: Magdalena Bay, Lung 28; Magdalena Island, January IS, 

 1889, Brandegee. 



5. Hesperonia oligantha Standley, Contr. Nat. Herb. 12: 363. 1909. 



Type locality, "Calmalli, Lower California." Type collected in 1898, C. A. Pur- 

 pus 82. 



No further material of this species has been seen. 



6. Hesperonia californica (A. Gray) Standley, Contr. Nat. Herb. 12: 364. 1909. 

 Oxybaphus glabrifolius cassifolius Choisy in DC. Prodr. 13 2 : 431. 1849. 

 Oxybaphus glabrifolius Torr.U . S. Rep. Expl. Miss. Pacif. 4: 131. 1857, not Vahl. 

 Mirabiiis californica A. Gray, Bot. Mex, Bound. 173. 1859. 



Oxybaphus californieus Benth. & Hook. Gen. PI. 3: 4. 1880. 

 Type locality, none givsn. 



