1626 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



SuflFruticose ; leaves petiolate to sessile and auriculate, oblanceolate to spatulate, 

 1.5 to 5 cm. long, 1 cm. or less broad, subentire to acutely dentate, white-tomen- 

 tose on both surfaces in the early stages, more or less glabrate above; heads 8 to 

 10 mm. high, radiate; bracts of the involucre usually 13; ray flowers about 8; 

 rays yellow; disk flowers 30 to 40; achenes serieeous-hirtellous. 



11. Senecio stoechadiformis DC. Prodr. 6: 429. 1837. 

 South Mexico; type from Villalpando. 



SufFruticose, canescent-lanate throughout; stem erect, usually branched; 

 leaves lanceolate to linear, 3 to 13 cm. long, 2 to 10 mm. broad, attenuate at both 

 ends, acute at the apex, entire or remotely denticulate, floccose-tomentulose 

 above in the earh- stages but somewhat glabrate, persistently white-tomentose 

 beneath; margins commonly revolute; heads 8 to 12 mm. high, radiate; bracts of 

 the involucre usually numerous; achenes canous-hirtellous. 



12. Senecio procumbens H. B. K. Nov. Gen. & Sp. 4: 177. 1820. 

 Senecio helleri Klatt, Abh. Naturf. Ges. Halle 15: 333. 1882. 



South Mexico at high altitudes; type from the mountains near Toluca. 



A low SufFruticose alpine plant, white-tomentose throughout; stems prostrate 

 or ascending, 5 to 20 cm. high, leafy; leaves oblanceolate or somewhat spatulate, 

 1.5 to 5 cm. long, 0.5 to 1 cm. broad, entire to sinuate-dentate, white-tomentose 

 on both surfaces, occasionally somewhat glabrate above; heads 1 to 1.5 cm. 

 high, few or solitary, radiate; disk flowers numerous; achenes glabrous. 



13. Senecio calcarius H. B. K. Nov. Gen. & Sp. 4: 184. 1820. 

 Senecio mairetanus DC. Prodr. 6: 430. 1837. 



Senecio chrysactis Schultz Bip.; Hemsl. Biol. Centr. Amer. Bot. 2: 237. 1881 

 South Mexico, rock\^ places above timber Hne; tj^pe collected between Mazatldn 

 and Chilpancingo, Guerrero. 



A low branched erect shrub, 1 meter or less high, white-tomentose throughout; 

 branches leaf}'; leaves linear-lanceolate, 2 to 10 cm. long, 1.5 to 10 mm. broad, 

 acute, entire, coriaceous, revolute-margined, entire, at first tomentulose, later 

 more or less glabrous above, densely and permanently white-tomentose beneath; 

 heads few, 1.5 to 2 cm. high, radiate; bracts of the involucre about 21, floccose- 

 tomentose; ray flowers usually 13; rays bright yellow; disk flowers numerous; 

 achenes glabrous. 



14. Senecio cinerarioides H. B. K. Nov. Gen. & Sp. 4: 183. 1820. 

 South Mexico; tjpe from Mordn. 



Fruticose, 1 to 2.5 meters high; stem below smooth and glabrous, above 

 angled, striate and, as well as the branches, tomentulose; leaves sessile, narrowly 

 lanceolate, 5 to 18 cm. long, 0.5 to 1.5 cm. broad, acute, entire or denticulate, 

 tomentulose above in the younger stages, later glabrate, persistently white- 

 tomentose beneath, the upper leaves usually auriculate-sagittate at the base; 

 inflorescence many-headed; involucral bracts usuallj^ 21, the calyculate bracteoles 

 lanceolate, conspicuous, subsquarrose; ray flowers about 13; rays yellow; disk 

 flowers numerous; achenes sparingly hirtellous or glabrous. 



15. Senecio argutus H. B. K. Nov. Gen. & Sp. 4: 183. 1820. 

 South Mexico; type from Cofre de Perote. 



SufTruticose; upper part of stem and branches striate; leaves tomentulose on 

 both surfaces, somewhat glabrate above; heads many, 10 to 13 mm. high, 

 radiate; involucre of about 13 bracts; ray flowers commonly 8; rays pale yellow; 

 disk flowers numerous; achenes hirtellous. 



16. Senecio thomasii Klatt, Abh. Naturf. Ges. Halle 15: 332. 1881; Leo- 

 poldina 24: 126. 1888. 



Senecio lindenii Schultz Bip.; Klatt, Abh Naturf. Ges. Halle 15: 332. 1881. 

 Senecio deppeanus Hemsl. Biol. Centr. Amer. Bot. 2: 239. 1881. 



