286 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



compound cymes, these usually long-stalked; free portion of the 

 perianth about 5 mm. long; stamens 2 or 3; fruit conspicuously 

 winged. 



1. Ammocodon chenopodioides (A. Gray) Standi., Wash. Acad. Sci. 

 Jour. 6: 631. 1916. 



Selinocarpus chenopodioides A. Gray, Amer. Jour. Sci., ser. 2, 

 15: 262. 1853. 



Duncan, Greenlee County (Davidson in 1900), Chiricahua Moun- 

 tains, Cochise County (Lemmon in 1881), Tucson, Pima County 

 (Thornier 259), 2,400 to 4,000 feet, late summer. Western Texas to 

 southern Arizona and Chihuahua. 



3. ACLEISANTHES 



Plant perennial; stems low and spreading from a woody root; 

 flowers axillary, solitary, the subtending bracts small, separate, per- 

 sistent; perianth salverform, the free portion 8 cm. long or longer, 

 the tube very slender; stamens 2 to 5, often exserted; fruit angled or 

 ribbed. 



1. Acleisanthes longiflora A. Gray, Amer. Jour. Sci. ser. 2, 15: 261. 

 1853. 



Salt River Mountains, Maricopa County (Bailey in 1913), Table 

 Top Mountain, Pinal County (Harrison and Kearney 7299), Plomosa 

 Mountains, Yuma County (Peebles and Fulton 8515), 2,000 to 3,000 

 feet, among rocks, April to August. Texas to California and northern 

 Mexico. 



Plant night blooming, the flowers fragrant. It is known in Cali- 

 fornia as yerba-de-la-rabia, and sometimes (erroneously) as "angel- 

 trumpet." 



4. MIRABILIS. Four-o'clock 



Plants herbaceous, perennial; leaves opposite, petioled, with broad 

 blades; flowers solitary or several in the calyxlike involucre; perianth 

 salverform or funnelform; stamens 3 to 5; fruit smooth or tuberculate, 

 sometimes 5-ribbed. 



Key to the species 



1. Involucre subtending more than 1 flower; perianth purplish red (2). 



2. Perianth not more than 1 cm. long; involucre subrotate, 3-flowered; perianth 

 campanulate-funnelform; stamens 3, the filaments separate; herbage 

 copiously viscid- villous to glabrate 1. M. oxybaphoides. 



2. Perianth 4 to 6 cm. long; involucre campanulate, usually more than 3- 



flowered; perianth tubular-funnelform; stamens 5, the filaments connate 

 at base; herbage puberulent, commonly not viscid- _ 2. M. multiflora. 

 1. Involucre subtending a single flower (3). 



3. Perianth about 1 cm. long, less than 3 times as long as the involucre, salver- 



form-campanulate, white or pinkish; fruit smooth, longitudinally 



striate but not angled or ribbed 3. M. bigelovii. 



3. Perianth at least 3 cm. long, 3 or more times as long as the involucre, funnel- 

 form or elongate-salverform; fruit rugose-tuberculate, obtusely angled 

 or ribbed (4) . 

 4. Stamens not conspicuously exserted; perianth bright red or purplish red, 



not more than 6 cm. long 4. M. jalapa. 



4. Stamens conspicuously exserted; perianth white or tinged with purple, 7 

 to 17 cm. long 5. M. longiflora. 





