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External and Internal Changes Associated with Basal-crook Formation in Pitch and Shortleaf Pines [by] Silas Little and Francois Mergen

Silas Little

出版	1966
URL	http://books.google.com.hk/books?id=XUtONwAACAAJ&hl=&source=gbs_api

註釋

Successive sketches show changes in basal form of 10 Pinus rigida Mill. and 22 P. echinata Mill. seedlings through their first 6 years, or until the seedling died. Only two of the 21 seedlings surviving 6 years (one of each species) did not form a typical basal crook.