They were covered in great hallucinatory blossoms, pentangular in form.    From Wordnik.com.  [Cold Mountain]

It consists of a boatload of pentangular cards, each side of which hold a word and a value.    From Wordnik.com.  [A Kit an' Kaboodle from McNeill Designs] Reference

About the two points found in the lower level, Kimball said that their roughly pentangular form appears to be the intended shape, that is, they were not re-worked over time to that shape.    From Wordnik.com.  [Cactus Hill Update] Reference

One long seed enclosed within the calyx, pentangular, covered with a membranaceous skin.    From Wordnik.com.  [The Medicinal Plants of the Philippines] Reference

They were brown and pentangular, with a short stem, and slightly punctured at the intersections.    From Wordnik.com.  [Ceylon; an Account of the Island Physical, Historical, and Topographical with Notices of Its Natural History, Antiquities and Productions, Volume 1 (of 2)] Reference

They were brown, and pentangular, with a short stem, and slightly punctured at the intersections.    From Wordnik.com.  [Sketches of the Natural History of Ceylon] Reference

"The flowers, which bloom in July and August, are of a pale pink or rose color: the calyx, or flower-cup, is bell-shaped, obscurely pentangular, villous, slightly viscid, and presenting at the margin five acute, erect segments.    From Wordnik.com.  [Tobacco; Its History, Varieties, Culture, Manufacture and Commerce] Reference