SUN FLOW EI ! FAMILY. 



545 



commonly somewhat hairy at base; disk-corollas beardless; achenes 

 surrounded by a thick and corky rugose wing, smooth and glabrous 

 on the back, the inner face sparsely papillose, or with a row of 

 tubercles on the median ridge; pappus-cup either entire or 2-lobed. 

 Sacramento Valley. 



2. L. calliopsidea Gray. Leafy, with less scape-like peduncles, 

 1 to 2 ft. high; bracts of the outer series of the involucre broadly 

 ovate, a little snorter than the narrowly ovate inner ones, commonly 

 1 in. long, $ in. wide and 15 to 20-nerved; ring of the disk-corolla 

 pubescent; achenes of the ray- and outer disk-flowers oval, flat and 

 glabrous; disk-achenes cuneate-oblong, long-villous on the margins 

 and inner face; pappus-palea? 2, linear. — (Pugiopappus calliopsideus 

 Gray. ) 



Moist hillsides in the South Coast Ranges. 



Tribe 8. Ambrosieae. Ragweed Tkibe. 

 63. IVA L. 



Ours coarse herbs with thickish alternate (or the lower opposite) 

 leaves and small nodding heads of greenish white flowers. Involucre 

 hemispherical, its bracts few and rounded. Receptacle with chafl- 

 like linear or spatulate bracts. Marginal flowers of the head pistilhit<\ 

 1 to 5 in number, their corollas tubular or none. Disk-flowers per- 

 fect, with 5-lobed funnelform corolla and undivided style. Anthers 

 almost distinct. Achenes flattened, glabrous. Pappus none. (Said 

 to be named after Ajuga Iva of the Mint Family, on account of the 

 similar odor.) 



]. I. axillaris Pursh. Poverty Weed. Stems many, erect 

 from a decumbent or prostrate base, 6 to 10 in. high; reaves narrowly 

 obovate, varying to lanceolate or linear, entire, sessile; heads solitary 

 in the axils, short-peduncled, surpassed by the leaves; bracts of the 

 involucre united into a lobed or merely toothed cup. 



Alkaline plains and borders of salt marshes: Sacramento Valley; 

 San Joaquin Valley; Livermore Valley and southward. Aug.-Sept. 



(34. AMBROSIA L. Ragweed. 



Ours a coarse homely but aromatic perennial herb with alternate 

 pinnatifid leaves and inconspicuous greenish unisexual flowers. 

 Heads of staminate flowers disposed in erect ament-like racemes: — 

 involucres broadly turbinate; receptacle of at least the outer flowers 

 with slender bracts; corollas funnelform, o-lobed. Heads of pistillate 

 flowers in the axils of the upper leaves at the base of the staminate 

 racemes: — involucres oblong or turbinate, closed, containing but a 

 single flower; corolla none; pappus none; fruit an achene-like bur 

 which is beaked or pointed and is armed near the top with a single 

 row of prickles. (Ancient Greek name.) 



1. A. psilostachya DC. Western Ragweed. Stems simple, 

 erect, 1, 2 or more ft. high, from slender running rootstocks; herbage 



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