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- Idaho, and northern Nevada. Relatively narrow-leaved, montane forms of P. tenellus account for reports of P. oregonus from the southern Sierra Nevada to Baja3 KB (283 words) - 20:55, 5 November 2020
- globiferus are superficially somewhat intermediate between P. brevissimus and P. tenellus, as are populations from southern California mountains with leaves somewhat3 KB (242 words) - 20:55, 5 November 2020