Robinson : Revision of the Genus Guardiola. 233 



Hartman^ nos. 124, 270; F. E. Lloyd, no. 420; S.W. Chihuahua. 

 Palmer, no. 35 (coll. of 1885). 



-T- -K +- Heads few and large, in umljclliform clusters at the ends of the branches, the 

 subtending bracts almost as large as the foliar leaves : leaves petiolate, subrenifonn- 



ovate, deeply cordate. 



3. G. Rosei sp. nov. 



Slender glabrous and glaucous perennial, 3-4 dm. high ; stems 

 terete, striate ; branches opposite : petioles 6-Z mm. liong ; leaves 



subreniforni-ovatc, coarsely cuspidate-dentate, 3 -nerved from the 

 base, 4-5.5 cm. long, 3-4.8 cm. broad, bright green above, glau- 

 cous beneath, acutish and cuspidate at the tip, cordate with a rather 

 deep open sinus at the base ; the floral leaves scarcely smaller ; 

 3-headed terminal cymes surpassed by their subtending bracts; 

 pedicels glabrous, glaucous, 1-2 cm. long ; involucral scales ob- 



long, obtuse, 1.3 cm. long, 5 mm. broad: ray-flowers about 3 ; 

 ligulcs oblong, white, 4 mm. long, the slender tubes 6 mm. in 

 length : achcnes moderately compressed, upw^ardly villous under 

 a lens, at maturity 6 mm. long, fuscous, minutely mottled ; disk 

 flowers 4-5-parted. 



Collected between Sta. Gertrudis and Sta. Teresa, Tepic, 



Mexico, by Dr. J. N. Rose, 8 August, 1897, no. 2078, and 96 km. 



south of Guadalupe y Calvo, S. W. Chihuahua, altitude 2300- 



2600 m., by E. W. Nelson, August, 1898, no. 4806. Types in 



herb. Gray and herb. U. S. Nat. Museum. 



* * Outer involucral scales carinate. 



r 



4. G, carinata sp. nov. 



Branched slightly lignescent perennial, finely ciliated upon the 

 young petioles, otherwise glabrous : stem slender, terete, glaucous : 

 petioles about 1.3 cm. long, glabrate : leaves lance-oblong, subhas- 

 tately angled or toothed on either side the subcordate base, finely 

 serrate with incurved cartilaginous-tipped teeth, scarcely pale be- 

 neath, 3-4 cm. long, 1.8-2.2 cm. broad: pedicels 7-9 mm. long, 

 axillary or cymose at the ends of the branches ; involucres in an- 

 thesis I.I cm. long; scales ovate, obtuse to acuminate, the 3 outer 

 ones strongly carinate : ray-flowers much later in their develop- 

 ment than the disk-flowers, the heads thus proterandrous : ligulcs 

 minute : achenes pale, subterete, 6 mm. long, upwardly villous 

 . under a lens, minutely mottled. 



Collected by Dr. J. N. Rose at Acaponeta, Tepic, Mexico, 23 



June, 1897, no. 1498. Well marked by its carinate involucral 



• scales, which are not found elsewhere in the genus. Types in 



herb. Gray and herb. U. S. Nat. Museum. 



