382 COMPOSITAE 
1. Conyza coulteri A. Gray. Coulter’s Conyza. Fig. 5655 
Conyza coult tert A. Gray, Proc. Amer. Acad. 7: 355. 1868. 
Conyzella coulteri Greene, Fl. Fra 
Esche askie coulteri Rydb. Bull. eehotns Club 33: 154, 1906. 
Annual, usually 1-stemmed, 0.2-1 m. high, usually simple below the much-branched in- 
orescence stipitate-glandular and spreading-pilose aoe de many-celled hairs throughout (including 
to 10 cm. long 
volucres), very leafy. Basal leaves cuneate-obovate . long, sharply toothed, acute, 
rian ng to the ne eine petiole; stem-leaves din gg oblong, 1-6.5 cm. long, 2-20 mm. wide, 
sessi z somewhat clasping, sharply serrate to coarsely and doubly serrate, with a id- 
b; heads small, 4—5 h in fruit, very erous in a vi pyramidal panicle; 
in 2 igh, about 2-seriate, subequal, the phyllaries linear, te, ee 
center and whitish margin, the outer m herbaceous, the subscarious; pistillate flowers 
very numerous, their corollas whitish, about -_ as long as the style and pappus; perfect flowers 
5-10; pistillate achenes elliptic-oblong, 0.7 mm. long, hispidulous, their pappus fragile, rather 
sparse, white, 3 mm. long; disk-achenes saiuhedivas with glanduliform 
Valley flats and plains, atten in alkaline soil, Langa ay aot goceerine as a weed, Up pper r Son 
Zones; central Calibicnia in Santa Clara, Santa Cruz, and Am r Counties south, tooheta ~~ Pt oe a 
to San Diego County and Lower Californ nia, east to Colorado pee "Teens and south to Mexico, Type locality: not 
definitely stated. Collected rated Coulter. April- Oct 
2. Conyza bonariénsis (L.) Cronquist. South American Conyza. Fig. 5656. 
Erigeron bonari as SpePl. 863.1753: 
Erigeron cr rispus P Mém. Acad. Toul. 3: 318. 1788. 
Erigeron undulatus wou Meth. 598. 1794 
Erigeron linifolium bak on Be od Be . 1955, 1804. 
Conyza ambigua DC. Franc. 6: 468. 1815. 
— ign aal eg ba Acad. St. sesh i 235. 1856: 
Il . Fran. 386. 
Conyza b is Cronquist, Bull. asta i, 70: 632. 1943, 
denial usually 5 dm. high or less, subsimple or with erect oe si branches as long as or longer 
than the ma stem and leaves oe Sse strigose or incurved-pubescent and also hir- 
sute — hispid. Leaves linear to lance-linear, or the lower sla ceolate, mostly 8 cm. long or less, 
wide or less, the lower coe laciniate-toothed, uF upper re; heads trad bin or pi 
isicscesy 5-6 mm. high, racemo: in a narrow pan Tesh similar t at of C. cana- 
ensis, 4 mm. high, the ohoteaiics ; Seauely hirsut aes aie middle; pis Sette corollas very 
ons sm whitish, filiform, slightly dilated and acutely 3- Boothed at the often purplish apex, at 
maturity much te =. the style, equalling the pappus; perfect pte bes ; achenes 
Siveaeaioes. ot rved; pappus simple, brownish white, rufescent in old s 
Waste places near aly ag adventive at Portland, Oregon, sat occurring more ae ia central Cali- 
fornia and the Bay Region to southern Cal ifornia, east to Florida and New Jersey, south to South America; intro- 
duced from South Am es, Type locality: Buenos mee June—Au 
Conyza floribinda H.B.K. Nov. Gen. & 4 1820. (Conve albida Willd. ex Spreng. Syst. 3: 514. 
ing Erigeron for eeenne t pone ee. Bull, ibe “Fr. 12:81. 1865. . Lateral branches of the Scavecaleane 
not surpassing the $; pubescence Se C. bonariensis; heads somewhat smaller than that species. 
Adventive at Portiond. ches Type locality: near Quito, Ecuador. 
Conyza bilbaoana Remy ok Gay, Fl. Chil. 4: 76. 1849. Differs from C. canadensis in having obliquely 
sg, — flowers in the hea mo ie in being perennial - at least persisting more than one season. Adventive 
n San Francisco Count ne Aemiecg italiey : South America. 
Cone 
3 
oe 
=| 
~ 
wn, 
n 
be 
3. Conyza canadénsis (L.) Cronquist. Horseweed. Fig. 5657. 
rigcron canadensis L, Sp. . pe uS 
Eri 
Conyzella canaden. mie d. St. Pétersb. VIT. 14: 51. 1869. 
id dg in conadens dhe Wrown, Til FL 3: 391. 1898. 
Con , Bull. Torrey Club 70: 632. 
1943. 
Marsea anadenst. Badillo, Bol. Soc. Venez. Cienc. Nat. 10: 256. 1946. 
Annual, strict, . a high sd less, simple below, with many erectish branches above, leafy into 
the i em and leaves (es specially - ’ margin) hispid or hirsute. Leaves numerous, 
paged to a ig et or the lower oblanceolate, 2-10 cm. long, usually 2-8 mm. wide, entire 
r the lower ser eather-vei 3-4.5 
fe a pi 
central glandular area and narr a auteacions margin; rays numerous ef not more than , white, 
short and inconspicuous, er aah, a the disk by 1 mm. or less ; achenes hirsutulous ; pappus ’simple, 
dirty-whitish. 
Cultivated and waste places, nearly throughout temperate Bort, America south to South America; naturalized 
in Europe. Type jain “Canada, Virginia.” Jun stent. Hogwee 
Cen ensis var. egy nll (A, Gray) Cronquist, — gus Club 74: 150. 1947. (Erigeron cana- 
densis var poe vrcanes A. Gray, . Nat goon = ver 850.) Differs from C. canadensis var. canadensis 
in having the stems glabrous or ee so. Mor aie area than the typical form but having much the 
same distribution. Type locality: Texas. 
94. BACCHARIS L. Sp. Pl. 860. 1753. 
_ Dioecious shrubs, rarely only suffrutescent. Leaves alternate, entire or toothed, usually 
thick and firm. Heads discoid, small or medium, usually numerous and many-flower red. 
