fugacious

The Reporter, on the other hand, calls it "a fugacious bit of whimsy that can only be judged minor Woody Allen".

From The Guardian ● Jul. 18, 2014

Seeds globular.—Low slender perennials, with fibrous roots, grassy or lanceolate leaves, mostly branching 2-edged or winged stems, and fugacious umbelled-clustered small flowers from a 2-leaved spathe.

From The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee by Asa Gray

P. ovoid then convex, striate, deep yellow-ochre; g. numerous, slightly adnexed, colour of p.; s. white, ring fugacious, long rooting. capistrata, Cke.

From European Fungus Flora: Agaricaceae by George Massee

P. globose then convex, dry, satiny, white, soon tinged yellow or reddish-yellow; g. broad, brown; stem with a turbinate bulb, white, suffused with reddish-yellow; flesh white, ring fugacious; sp.

From European Fungus Flora: Agaricaceae by George Massee

Flowers perfect, regular or somewhat irregular, with 3 more or less herbaceous persistent sepals and 3 fugacious petals.

From The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee by Asa Gray