STANDLEY — TREES AND SHRUBS OF MEXICO. 785 



7. Gossypium schottii Watt, Wild & Cult. Cotton 206. pi. 35. 1907. 

 Yucatan ; type from M^rlda. Reported from Paraguay. 



Leaves usually 3 or 5-lobed, the lobes mostly oblong or narrowly oblong, 

 long-acuminate, glabrous or nearly so, spreading ; bractlets free ; petals yellow, 

 tinged with purple. " Xchup " (YucatSn, Maya). 



8. Gossypium microcarpum Tod. Hort. Panorm. 1: 63. pi. IJf. 1876. 

 Described from plants believed to be of Mexican origin. The species has 



been found in cultivation in Peru, Brazil, Africa, and the Philippines. 



Lobes of the leaves ovate, acute; bractlets large, glabrous, deeply cordate; 

 petals pale yellow, without purple spots; seeds with greenish or brownish 

 fuzz and dirty-white coarse cotton. 



9. Gossypium mexicanum Tod. Rel. Cult. Cot. 193. pi. 6. 1877-78. 

 Cultivated in Mexico and probably growing also without cultivation. Widely 



cultivated in other regions. 



Plants shrubby ; petioles and pedicels usually pilose at first ; leaves 7 to 

 15 cm. wide, the lobes broadly ovate ; petals pale yellow or white, flushed with 

 pink, scarcely exceeding the bractlets; seeds with ashy fuzz and dull white 

 to reddish cotton. " Ichcaxihuitl " (Nahuatl; "wool-plant"). 



The plant is treated by Hernandez ^ in a chapter entitled " De Tchcaxihuitl 

 seu Gossypio." 



10. Gossypium hlrsutum L. Sp. PI. ed. 2. 975. 1763. 



Cultivated in Mexico and growing without cultivation in many localities. 

 Cultivated in many parts of the earth. 



Plants herbaceous or often woody, with reddish stems, the branches and 

 leaves sparsely or densely hirsute ; petals yellow or pale yellow, often purplish 

 at base; capsule usually 4-celled. 



19. THURBERIA A. Gray, Mem. Amer. Acad. n. ser. 5: 308. 1854. 



1. Thurberia thespesioides A. Gray, Mem. Amer. Acad. n. ser. 5: 308. 1854. 



Gossypium thurberi Tod. Prodr. Gossyp. 7. 1878. 



Chihuahua, Sonora, and Jalisco ; type collected near Cocospera and Ymurls, 

 Sonora. Southern Arizona. 



Plants herbaceous or fruticose, 1 to 3 meters high, glabrous or nearly so; 

 leaves long-petiolate, the blades mostly 3-parted or deeply 3-lobate, the divisions 

 lanceolate, entire, long-acuminate, gland-dotted ; flowers axillary or subcorym- 

 bose ; bractlets 3, longer than the truncate calyx ; petals about 2.5 cm. long, 

 white, turning purplish, black-dotted; capsule 3-celled, 12 to 20 mm. long; 

 seeds woolly. " Algodoncillo " (Sonora). 



This plant has been referred erroneously by some authors to Ingenhouzia 

 triloba DC. 



20. ERIOXYLUM Rose & Standi. Contr. U. S. Nat. Herb. 13: .^07. 1911. 



Shrubs or trees ; leaves long-petiolate, entire ; flowers chiefly axilltiry, usually 

 appearing before the leaves; bractlets 3, much shorter than the calyx; petals 

 purple; capsule 3-celled, ovoid, covered with large black glands; seeds woolly. 



Calyx with 5 triangular acuminate lobes ; pedicels 10 to 15 mm. long. 



1. E, palmeri. 

 Calyx obscurely repand-dentate ; pedicels 2 to 5 mm. long 2. E. aridum. 



* Thesaurus 308. 1651. 

 7808—23 18 



