'234 Robinson: Revision of the Genus Guaroiola, 



* ** Involucral scales dorsally convex but not carinate ; leaves lauce-oblong to linear, 

 petioled. 



1 



-i— Leaves cordate or subcordate at the hastately lobed base, coarsely toothed. 



5. G. odontophylla sp. nov^ 



Glabrous, somewhat glaucous : stem terete, purple^ striate, 

 branched: petioles 8-10 mm. long; leaves lance-oblongs coarsely 

 and somewhat doubly dentate, 5 cm. long, 2.2 cm. broad at the has- 

 tately bilobed base, green on both sides, the teeth rather broad, spread- 

 ing, scarcely at all incurved, acutish to acuminate ; the floral leaves 

 scarcely reduced, bearing elongated basal lobes : heads subumbel- 

 late by 2\s and 3's at the ends of the branches ; pedicels 3-4 mm. 

 long ; involucral scales lance-oblong, acute, i cm. '<^ng : achenes 

 ashy, punctate, upwardly villous under a lens, compressed, 7 mm. 

 long. 



Collected by E. W. Nelson between Ramos and Inde, Du- 



raiigo, II to 14 August, 1898, no. 4683. Types in herb. Gray 



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



4— +- Leaves cuneate or obtuse at the base. 



++ Heads relatively broad; involucres 4 mm. thick; pedicels 3-14 mm. long : leaves 

 (witli rare exceptions) hastately toothed at the base ; the floral leaves considerably 

 exceeding the cymes. 



i 



= Leaves serrate with close incurved teeth. 



-6. G. Mexicana Humb. & Bonpl. PL Aeq. i : 144, t, 41 ; HBK. 



^ Nov. Gen. et Spec. 4 : 247 ; Gray, PI. Wright, i : 1 11. 



G, atriplicifoUa Gray, L c. 



Michoacan, Hicniholdt & Boiipland^ Pringh^ no. 4167; Jalisco, 

 Palmer, no, 214 (coll. of 1886), Pringlc, no. 3484; Zacatecas, 

 Rosc^ no. 2737; Morelia, Galeotti, no. 2418; Mirador, Sartorius ; 

 Morelos, Pringle, no. 6184; Volcano of Toluca, Hclla% no. 443. 



A portion of Galeotti's no. 2418 (the type number of G, 

 artiplicifolia Gray) in herb. Gray so closely matches the per- 

 ennial specimens of G, Mexicana that, although originally de- 

 scribed as an annual, it seems undoubtedly this species, to which , 

 114 fact, Dr. Gray himself later reduced it (Proc. Am. Acad. 22 : 



423). 



Leaves dentate ; teeth very shaq:), spreading. 



7. G. arguta (Gray) 



G. TiilocarpiisxTW. arguta Gray, Proc. Am. Acad. 21 : 387. 

 Chihuahua, Pringle, rocky hills near the town of Chihuahua, 



