STANDLEY TKEES AND SHRUBS OF MEXICO. 769 



4. Lavatera insularis S. Wats. Proc. Amer. Acad. 12: 249. 1877. 



Known only from Coronado Island, Baja California. 



Leaves 7 to 15 cm. wide, 7-lobate, the lobes obtuse, coarsely crenate ; petals 

 3 to 4 cm. long, yellowish, striped with purple; carpels about 10. 



13. MALVASTRUM A. Gray, Mem. Amer. Acad. n. ser. 4: 21. 1849. 



Herbs or shrubs, with stellate pubescence; leaves often lobate; flowers 

 white, yellow, or red, axillary or terminal, each subtended by 1 to 3 bractlets ; 

 carpels 5 or more, 1-seeded, indehiscent or bivalvate. 



There are several Mexican species which are wholly herbaceous. Those listed 

 here are hardly true shrubs. 

 Petals 1.5 to 2 cm. long, red or pink. 



Calyx stellate-hispid 1. M. densiflorum. 



Calyx finely stellate-pubescent 2. M. fasciculatum. 



Petals 1 cm. long or less, variously colored. 



Stems strigose, the hairs 4-rayed, the rays in approximate pairs directed for- 

 ward and backward 3. M. coromandelianum. 



Stems with pubescence of branched hairs, the rays usually more than 4, 

 radiately divaricate. 



Carpels bicuspidate 4. M. bicuspidatum. 



Carpels rounded on the back, not bicuspidate. 



Carpels strigose or hispid above ; leaves not lobate ; flowers chiefly in 



terminal spikes 5. M. spicatum. 



Carpels glabrous, rarely finely stellate-pubescent when young; leaves 

 usually shallowly or deeply lobate; flowers chiefly in axillary clusters. 



Stems soon glabrous or nearly so 6. M. lacteum. 



Stems densely stellate-pubescent 7. M. ribifolium. 



1. Malvastrum densiflorum S. Wats. Proc. Amer. Acad. 17: 368. 1882. 

 Northern Baja California. Southern California ; type from San Jacinto 



Mountains. 



Stems 1 meter high or less, sufErutescent ; leaves round-cordate, 1.5 to 4 cm. 

 long, obtuse or rounded at apex, crenate-denate, often shallowly trilobate, stel- 

 late-pubescent ; carpels glabrous. 



2. Malvastrum fasciculatum (Nutt.) Greene, Fl. Franc. 108. 1891. 

 Malva fa^dculata Nutt.; Torr. & Gray, Fl. N. Amer. 1: 226. 1838. 

 Malvastrum thurieri A. Gray, Mem. Amer. Acad. n. ser. 5: 307. 1855. 

 Malacothamnus fasciculatus Greene, Leaflets 1: 208. 1906. 



Northern Baja California and Sonora ; type from Sonora. Southern Arizona 

 and California. 



Herbaceous or shrubby, sometimes 4.5 meters high ; leaves rounded-subcor- 

 date, 2 to 5 cm. long, obtuse or rounded at apex, often obscurely lobate, finely 

 stellate-pubescent ; inflorescence nearly naked ; carpels stellate-pubescent. 



3. Malvastrum coromandelianum (L.) Garcke, Bonplandia 5: 295. 1857. 

 Malva GoromandeUana L. Sp. PI. 687. 1753. 



Malva tricuspidata Ait. Hort. Kew. ed. 2. 4: 210. 1812. 



Malvastrum tricuspidatum A. Gray, PI. Wright. 1: 16. 1852. 



Sonora and Chihuahua to Tamaulipas, Yucatan, and Oaxaca. Widely dis- 

 tributed in ti'opical and subtropical regions. 



Plants essentially annual but often becoming fruticose; leaves chiefly rhom- 

 bic-ovate, often broadly so, 2 to 5 cm. long, obtuse or rounded at apex, usually 

 rounded at base, crenate-dentate, green, thinly strigose ; flowers mostly axillary 

 7808—23 ^17 



