Note especially the dark lanes that give to this nebula its name, trifid, and which run through its brightest parts, breaking it into seemingly independent sections.
"A Text-Book of Astronomy"
George C. Comstock
Vine vigorous, climbing; shoots more or less angled and pubescent; pubescence remaining only in patches on mature wood; canes mostly with short internodes; diaphragms thick; tendrils intermittent, long, strong, bifid or trifid.
"Manual of American Grape-Growing"
U. P. Hedrick
Vine vigorous, stocky, climbing; shoots cylindrical, densely pubescent; diaphragms medium to thick; tendrils continuous, strong, bifid or trifid.
"Manual of American Grape-Growing"
U. P. Hedrick