Robinson : Revision of the Genus Guakdiola. 



235 



no. 6;8 (type in herb. Gray), also in foothills of the Sierra Madre, . 

 no. 1 28 1. This species differs from G. Tidocarpus in 



heads and 



conspicuously elongated bracts, as well 



its large 

 as in the 



differently toothed leaves. 



++ +H- Heads smaller, numerous ; involucres 2.7 to 3 mm. in thickness : leaves not has- 

 tately toothed at the base : pedicels i to 2 (or rarely 4) mm. long. 



Upper bracts of the innorcscence elongated, surpassing the heads : leaves narrowly 

 lanceolate to linear. 



G. Tidocarp. 

 Acad. 22 : 423. 



8. G. angustifolia (Gi-a>^) 



var. 



■tih 



Gray in Wats. Proc. Am. 



Copiously and C}'mosel)' branched, 4-6 dm. hi^di ; petioles 8 

 mm. long ; leaves narrowly lanceolate to linear, scarcely paler be- 

 neath, serrate with five incurved callous-tipped teeth, not hastately 

 toothed at the cuneate base, 7-8 cm. Ion 



g, 1. 2- 1.4 cm. broad : 



heads numerous in small umbelliform, about 5-headed cymes; 

 pedicels very short, 1-3 mm. long ; involucres 7 mm. long, less 

 than 3 mm. in diameter ; scales acute : achenes gray, mottled, up- 

 wardly villous under a lens, 6 mm. long including the sterile 

 base. 



Jal 



near Tequila, Palmer, no 360 (type in herb. 



no. 1737. 



Gray), and on hillsides near Guadalajara, Pringlc 



Differs from G. Tidocarpus not only in the form of the leaves but 

 in the length of the bracts and general character of the inflorescence. 



Upper bracts very small, much shorter than the heads : leaves lance-oblong. 



9. G. TuLOCARPus Gray, PI. Wright, i : in. 



i 



TidocarpiLS Mcxicanus Hook. & Arn., Bot. Beech. 299, t. 6j. 

 Tepic, Lay & CoUic ; Zapelote, State of Tepic, Lamb^ no. 580; 



m, Gregg, no. 585 ; Colima, 



Mazatl 



Palmer, no. 1198 (coll. of 1891). 



Readily recognized by its numerous small heads in close com- 



pounded small -bracteal cymes. 



Cray Herbarium of Harvard Umversitv. 



