STANDLEY TREES AND SHRUBS OF MEXICO 1537 



triplinerved, short-petioled; heads in small close cymose panicles at tips of 

 branches, cylindric, about 8 mm. high, yellow; ray flowers 5 or wanting, neutral; 

 disk flowers 10 to 18; involucre strongly graduate, of indurate, obtuse or rounded,, 

 vittate phyllaries; achenes obovoid-oblong, about 2 mm. long, trigonous or sub- 

 quadrangular, glabrous, epappose. "Balayaqui." 



55. ZALUZANIA Pars. Syn. PL 2: 473. 1807. 



Reference: Robinson & Greenman, Proc. Amer. Acad. 34: 530-534. 1899. 



Herbs or shrubs; leaves alternate; heads radiate or discoid, yellow, solitary to 



panicled; involucre about 2-seriate, appressed; receptacle conical; rays fertile; 



achenes of the ray trigonous, sometimes with a few deciduous aristiform squamel- 



lae; disk achenes somewhat compressed, epappose. 



Heads discoid 7. z. pringlei. 



Heads radiate. 



Leaves 3-lobed 1, Z. grayana. 



Leaves entire to dentate, not lobed. 



Leaves densely canescent-tomentulose beneath. 



Involucre green, merely puberulent 2. Z. augusta. 



Involucre canescent-tomentulose. 



Leaf blades ovate or triangular, obtuse, abruptly contracted into 



often winged petioles 3. Z. raoUissima. 



Leaf blades rhombic-ovate or elliptic-ovate, cuneately narrowed into 



short naked petioles 4. Z. megacephala. 



Leaves green or griseous-pubescent beneath. 



Leaf blades triangular-ovate, 1 to 4 cm. wide, abruptly contracted into 



winged petioles 0.5 to 2 cm. long 5. Z. montagnaefolia. 



Leaf blades broadly ovate or oval-ovate, 3.5 to 8.5 cm. wide, on short, 

 essentially naked petioles 6. Z. coulteri. 



1. Zaluzania grayana Robins. & Greenm. Proc. Amer. Acad. 34: 531. 1899. 

 Gymnolomia triloba A. Gray, Proc. Amer. Acad. 17: 217. 1882. Not Zalu'- 



zania triloba Pers. 1807. 



Chihuahua. Arizona and New Mexico; tj'pe collected south of Rucker's 

 Valley, Chiricahua Mountains, Arizona. 



Suffrutescent, 80 cm. high; stem puberulous; leaf blades ovate, 3 to 7 cm. long, 

 green on both sides, the primary lobes toothed or slightly lobed; heads about 

 2 cm. wide. 



2. Zaluzania augusta (Lag.) Schultz Bip. Flora 44: 562. 1861. 

 Ferdinanda augusta Lag. Gen. & Sp. Nov. 31. pi. 2. 1816. 



Anthemis lutescens Cervant. in Llave & Lex. Nov. Veg. Descr. 1: 30. 1824. 



Chrysophania fastigiata Kunth; Less. Syn. Gen. Comp. 224. 1832. 



Ferdinanda lutescens DC. Prodr. 5: 553. 1836. 



Zaluzania angusta Benth. & Hook. Gen. PI. 2: 362. 1873. 



Guanajuato to Mexico; type from Mexico, without definite locality. 



Shrub up to 2.5 meters high, much branched; leaf blades lance-ovate to tri- 

 angular-ovate, 1.5 to 7 cm. long, entire to coarsely toothed; heads 7 to 12 mm. 

 wide, numerous in cymose panicles; phyllaries lance-ovate to ovate, mostly 

 acutish. "Caxtidani" (Queretaro); "cenicilla;" "limpia-tunas" (Mexico, 

 Oaxaca) . 



The name "limpia-tunas" is said to be given because of the fact that the plant 

 usually grows with prickly-pears, and the branches are used as brushes for re- 

 moving the fine spines from the tunas. The plant is said to have the odor of 

 southernwood {Artemisia abrotanum). 



