1500 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



The name "chamicillo" is reported for a Mexican species of uncertain specific 

 position. Baccharis coridifolia DC. of South America is notorious as being poi- 

 sonous to sheep and cattle. An alkaloid, baccharine, has been separated from it. 

 B. halimifolia L., of the United States, is used in domestic medicine as a remedy 

 for affections of the respiratory system, Mice some of the Mexican species. 

 Leaves closely serrulate or serrate (teeth 5 to 10 per cm.). 



Heads in long spikelike or raceme-like panicles on the branches. 



3. B. ramulosa. 

 Heads in rounded terminal cymose panicles. 



Stem and branches glabrous or merely glandular-granular. 

 Leaves linear to narrowlj' oblanceolate or linear-oblanceolate. 



22. B. thesioides. 

 Leaves lanceolate (distinctly broadest near the base) to cuneate-oblong or 

 oval. 

 Leaves lanceolate, acuminate; pistillate heads tiny, about 3 mm. high. 



21. B. alamosana. 

 Leaves cuneate-oblong or cuneate to oval. 



Leaves regularly oval or oblong-oval, finely toothed^ .19. B. elegans. 

 Leaves cuneate or cuneate-oblong, rather coarsely toothed. 



20. B. bigelovii. 

 Stem and branches sordid-pubescent or sordid-puberulous. 



Phjdlaries (of both staminate and pistillate heads) with green, densely 

 and sordidly glandular-puberulous midline and densely arachnoid- 



ciliate margin 23. B. sordescens. 



Phyllaries not densely arachnoid-ciliate, often subglabrous. 



Phjdlaries rather densely ciliate, often purplish; staminate heads 4 to 

 6 mm. high; pistillate heads in fruit 7 to 10 mm. high. 



24. B. raultifiora. 

 Phyllaries obscurely ciliate, not purplish; staminate heads 3 to 4 mm. 

 high; pistillate heads in fruit 5 to 6 mm. high . _25. B. serraefolia. 

 Leaves entire to serrate, the teeth remote (1 to 3 per cm.). 



Leaves linear-lanceolate or lanceolate to elliptic-ovate, triplinerved, 5 to 

 10 cm. long. 



Heads few (about 3), long-peduncled 17. B. squarrosa. 



Heads numerous, panicled or cymose. 



Leaves elliptic, oblong-elliptic, or oval, entire, strongl}' triplinerved; 



branches usually sordid-pubescent or puberulous._27. B. trinervis. 



Leaves lanceolate, linear-lanceolate, or narrowly oblanceolate, nearly 



always toothed; branches glabrous or merely glandular-granular. 



Leaves chiefly oblanceolate, not acuminate, irregularly few-toothed 



above; pappus at maturity about 1 cm. long 4. B. neglecta. 



Leaves lanceolate or linear-lanceolate, acuminate, usually regularly 

 serrate or serrulate; pappus at maturity about 4 mm. long. 



26. B. glutinosa. 

 Leaves linear to cuneate, oblanceolate, or obovate, usually 1-nerved and less 

 than 5 cm. long, sometimes longer. 

 Leaves cuneate to broadly oblanceolate or obovate, less than five times as 

 long as wide. 

 Heads large, 8 to 12 mm. high, solitary at tips of short, very leafy branches, 

 these often arranged in long virgate racemes. 

 Larger leaves cuneate-oblanceolate, sharply serrate or serrulate. 



3. B. ramulosa. 

 Larger leaves oblanceolate, entire 13. B. macrocephala 



