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1 Trichomes at the tips of the receptacular bracts milky white, opaque, the head therefore appearing gray to white, obscuring the brown color of the bractlets.
..2 Mature heads 4-7 mm across; seeds obviously longitudinally striate (as seen at 10× magnification); scapes pilose throughout
..2 Mature heads 3.5-4 mm across; seeds not obviously longitudinally striate, the striations obscure and very fine (not visible at 10× magnification); scapes glabrous (or nearly so) distally