. An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian. bottoms. Iowa and North Dakota toSaskatchewan, Nebraska and Colorado. Has been referredto the western C. canesccns. July-Sept. 9. Cirsium ochrocentrum A. Gray. Yellovv-spined Thistle. Fig. 4644. Cirsium ochrocentrum A. Gray, Mem. Am. Acad. I : 110. ochrocentrus A. Gray, Proc. Am. Acad. 19 : 57. ochrocentrus Greene, Proc. Phil. Acad. 1892: 336. 1893. S
. An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian. bottoms. Iowa and North Dakota toSaskatchewan, Nebraska and Colorado. Has been referredto the western C. canesccns. July-Sept. 9. Cirsium ochrocentrum A. Gray. Yellovv-spined Thistle. Fig. 4644. Cirsium ochrocentrum A. Gray, Mem. Am. Acad. I : 110. ochrocentrus A. Gray, Proc. Am. Acad. 19 : 57. ochrocentrus Greene, Proc. Phil. Acad. 1892: 336. 1893. Similar to Cirsium nndulntum, but commonlytaller and more leafy, often 6° high, equallywhite-tomentose. Leaves oblong-lanceolate inoutline, usually very deeply pinnatifid into tri-angular-lanceolate, serrate or entire segments,armed with numerous long yellow prickles;lower leaves often 6-8 long; heads about 2broad, 1V-2 high, solitary at the ends of thebranches; outer bracts of the involucre lan-ceolate ; tipped with stout yellow prickles ofnearly or quite their own length, the inner nar-rowly lanceolate, long-acuminate; flowers pur-ple (rarely white?). On plains, Nebraska to Texas, Nevada and Ari-zona.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
