STANDLEY — ALLIONIACEAE OF MEXICO. 



413 



Specimens examined: 



Baja California: Aguaje de San Esteban, 25 miles north of San Ignacio, alti- 

 tude 370 meters, October 5, 1905, Nelson & Goldman, 7202; northern Lower 

 California, April 12, 1882, Orcutt. 



6a. Hesperonia californica microphylla Standley, Contr. Nat. Herb. 12: 365. 1909 

 Type locality, "San Martin Island, Lower California." Type collected by T. S. 

 Brandegee, March 12, 1897. 



Specimens examined: 



Baja California: Ensenada, April 26, 1893, Brandegee. 



7. Hesperonia polyphylla Standley, Contr. Nat. Herb. 12: 364. 1909. 



Type locality, "San Borga, Lower California." Type collected by T. S. Brandegee, 

 May 6, 1889. 

 Specimens examined: 



Baja California: Los Angeles Bay, 1887, Palmer 600. 



17. MIRABILIS L. 



Mirabilis L. Sp. PL 177. 1753. 

 Nyctago Juss. Gen. PI. 90. 1789. 

 Type species, Mirabilis jalapa L. 



The Mexican species of Mirabilis include almost the entire genus; a few other species 

 have been described from South America. 



KEY TO THE SPECIES. 



Stamens 3; anthocarp constricted near the base, viscid when 



moistened. (Perianth not expanding into a limb) 1. M. watsoniana. 



Stamens 5; anthocarp not constricted near the base, not viscid 

 when moistened. 

 Stamens twice as long as the perianth or more, the latter 

 tubular or with a very narrow limb; lobes of the 

 involucre obtuse. 

 Perianth somewhat dilated at the base, 4 mm. in diam- 

 eter, scarcely at all dilated above 2. M. pringlei. 



Perianth not dilated at the base, 2 mm. or less in diam- 

 eter, gradually dilated above 3 . M. exserta . 



Stamens considerably less than twice as long as the peri- 

 anth; lobes of the involucre acute. (Limb of the 

 perianth broader and more conspicuous.) 

 Perianth trumpet-shaped, gradually dilated from base 

 upward, 22 mm. long or less. (Angles of the 



anthocarp verrucose) 4. M. urbani. 



Perianth salverform, rather abruptly dilated into a 

 spreading limb, 30 mm. long or more. 

 Perianth 3 to 5 cm. long, red, yellow, or rarely 

 white, the tube dilated upward, not con- 

 spicuously elongated. 

 Leaves usually suhcordate at the base; petioles 

 short; involucre glabrate in age, 6 to 

 10 mm. long, the lobes oblong-lanceo- 

 late, long-acuminate, puberulent on 

 the margins; tube of perianth glabrous 

 or almost so ; stamens equalling or longer 

 than the perianth; style 35 to 50 mm. 

 long 5. M. jalapa. 



