SUNFLOWER FAMILY 521 
Estuarine marshes that border the lower Sacramento River and that are tidally inundated by salt or brackish 
aes Upper Sonoran Zone; a local endemic known only in the Suisun Marshes, Solano County, California. 
uly— sil 
Cirsium hydrophilum var. vaseyi i seas Gey a: LS aren. Leaflets West. Bot. J: Fi. (Cnicus 
joe var. Zon 1 eee ray, bebo Fl. 12: 404 : : Cirsium — genum En Beih Hg “Centralbl. 
35: 454. yi Jepson, Man a. Pi. Calif. nies 1925.) Plants more wid aly gi teste nee from below 
the middle; awa “somewhat Lesnest 3~- 3. 5 em. long; achenes oblongish or "elliptic, a little cuneate, 4-5 mm. long. 
Lop wes ground in areas of serpentine rock, Mount Tamalpais and adjacent ridges, Marin County, California. 
ay—july 
8. Cirsium mohavénse (Greene) Petrak. Mojave Thistle. Fig. 5909. 
Ganians maging heey , Proc. Acad. Phila. 1892: 361. 1893. 
rak, Bot. Tidsskr. 31: 68, 1911 
s with stout taproots, cpp nee blessnl al and monocarpic, or perhaps sometimes ee 
own ,0.5-2.5m 
to m. long an ce wide, tl me peelatt wide y oe on approximate, deltoid or quadrate 
with 2 lobes, the lobes and divisions stoutly spine-tipped, the margins rather strongly spiny, nar- 
rowed below into a longer or shorter, spinose-margined, petiole-like ase cali leaves becoming 
obviously sessile with the base Be saa prominently decurrent as a s iny w ing; upper leaves very 
spiny, much reduced and sometimes becoming a fascicle of stout “elongate spines, the base not 
always decurrent ; all leaves sare chnoid- paceice the tomentum thinner on the upper side, 
eihow pleas: vga solitary * the ends of short, peduncle-like stems or the og aks or less con- 
n s the 
oblongish, stramin neous to brown, 3.54.5 mm. lon —2 mm. wide; pappus ested white, 1.5 cm 
long, the bristles in the outer acai a merely ‘harheliglate: 
Saline soil near springs at oases, along ams nyons, and in low places in open valleys, Lower Sonoran 
Zone; deserts “ sidan a California: say cachiaie se ede to gf a 1 and Utah. Type locality: Rabbit 
Springs, Moja , San Bernardino County, California. June—Oct. 
9. Cirsium canovirens (Rydb.) Petrak. Gray-green Thistle. Fig. 5910. 
Carduus canovirens Rydb. Mem. N.Y. Bot. Gard. 1: 450. 1900. 
Cirsium canovirens Petrak, Beih. Bot. Centralbl. 35: 540. 1917. 
Plants biennial and perhaps sometimes monocar or becoming perennial with 1 or few stems 
arising from the scaly crown of a stout taproot, ssn not reproducing from root-buds; stems 
5908. Cirsium hydrophilum 
M 
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