A Grammatical Dictionary of Botanical Latin

Umbrella, parasol, sunshade: umbella,-ae (s.f.I), “a little shadow (umbra), a sunshade, parasol, umbrella” (Lewis & Short); umbraculum,-i (s.m.II), abl. sg. umbraculo, q.v.; umbrella,-ae (s.f.I), abl. sg. umbrella.

NOTE: the umbrella or parasol is composed of radiating braces or ribs that unite in the center, but curve downward (resembling an inverted cup). In the classic ‘umbel’ of the Apiaceae, the rays unite in the center, but the ribs curve upwards (rather like a cup).

Cynosciadium > Gk. from cyon, a dog + sciadion, a sunshade, "a fanciful designation referring to the umbels" (Fernald 1950); Sciadopitys,-yis (s.f.III), Umbrella Pine from Gk. skias,-ados, umbel + pitys, a pine or fir tree. "The spreading whorls of needles resemble the ribs of an umbrella or parasol, for which the Greek name was skiadeion" (Stearn 1996).

umbrella-shaped, umbraculiform: umbraculiformis,-e (adj.B), q.v.

Sciadopitys verticillata, Sieb. & Zucc., “leaves of two kinds, one small, scale-like ... bearing in their axils whorls of linear flat leaves” (Bailey 1949).