1502 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Plants glabrous or glandular-granular. 



Stems broomlike, at flowering time usually essentially naked or 

 with minute scale-like leaves; plants fastigiately much 

 branched. 



Pappus in fruit about 12 mm. long 6. B. sarothroides. 



Pappus in fruit 3 mm. long 11. B. sergiloides. 



Stems not broomlike, normally leafy; plants rarely fastigiate- 

 branched. 

 Heads mostly in clusters of 3 to 5 at tips of branches, short- 

 pediceled; leaves chiefly oblanceolate or elliptic-oblong, 

 entire, the larger about 2.5 cm. long, 7 mm. wide. 



14. B. palmeri. 



Heads solitar\' at tips of branches or cymose-panicled; leaves 



chiefly linear or very narrowly linear-oblanceolate. 



Heads several or numerous, loosely or rarely rather densely 



cymose-panicled; pappus 4 to 8 mm. long. 



Pistillate heads 6 to 7 mm. high, their pedicels 2.3 cm. 



long or less; pappus 4 mm. long; plant suffrutescent. 



15. B. potosina. 



Pistillate heads 9 to 10 mm. high, their pedicels 1.5 to 



7 cm. long; pappus 7 mm. long; plants herbaceous 



nearly throughout 16. B. occidentalis. 



Heads solitary at tips of the numerous branches; stems 

 usually less than 60 cm. high; pappus 10 to 15 mm. 

 long. 

 Stems much branched throughout, the leaves scattered, 

 the lower oblanceolate, the upper reduced. 



1. B. wrightii. 



Stems simple or subsimplc at least below, densely leafy 



throughout, the leaves linear or linear-oblanceolate. 



2. B. tezana. 



1. Baccharis wrightii A. Gray, PI. Wright. 1: 101. 1852. 

 Baccharis wrightii pyrrhopappa A. Gray, PI. Wright. 2: 84. 1853. 

 Chihuahua and Durango. Kansas to Texas and Arizona; type from Valley of 



the Limpio. western Texas. 



Herbaceous from a suffrutescent base, 50 cm. high or less, glabrous, pale green, 

 the stems striate, much branched, sparsely leafy above; lower leaves oblanceolate, 

 entire, 2 cm. long or less, the upper chiefly linear-subulate; invulucre 7 to 12 mm. 

 high, the phyllaries with conspicuous greenish center, acute or acuminate; 

 achenes 8 to 10-nerved, glandular-scabridulous; pappus rufescent, 1 cm. long or 

 more. 



2. Baccharis texana (Torr. & Gray) A. Gray, Mem. Amer. Acad. n. ser. 4: 



75. 1849. 



Linosyris texana Torr. & Gray, Fl. N. Amer. 2: 232. 1842. 



Tamaulipas. Texas; type from Texas. 



Stems several, mostly herbaceous from a suffrutescent base, nearly simple, 

 leafy throughout; leaves linear to narrowly linear-oblanceolate, the larger 2 to 

 4.8 cm. long, 1 to 3 mm. wide, 1-nerved, wavy-margined; involucre 4 to 8 mm. 

 long, the phyllaries with greenish midline; achenes about 8-nerved, glandular- 

 scabridulous; pappus rufescent, 1 cm. long or more. 



3. Baccharis ramulosa (DC.) A. Gray, Mem. Amer. Acad. n. ser. 5: 301. 1854. 

 Aplopappus ramulosas DC. Prodr. 5: 350. 1836. 



Baccharis pteronioides DC. Prodr. 5: 410. 1836. 

 Linosyris ramulosa A. Gray, PI. Wright. 2: 80. 1853. 



