Glossary: U

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umbel

An indeterminate inflorescence that has a greatly reduced central axis, such that the flowers appear to originate from the same point, usually resulting in a flat- or round-topped inflorescence, with a sequence of flowering from outside to inside.

umbellet

A small umbel.

umbo

A raised portion on the visible part of a scale of a seed cone.

unarmed

Without spines, prickles or thorns.

uncinate

Hooked at the tip (as in a hair).

undulate

Wavy-margined but without prominent teeth.

unisexual

A flower that bears only carpels or stamens.

unrankable

Status is not known due to lack of information or conflicting information.

unranked

Status is not yet assessed.

UPL

Obligate Upland: plant may occur in wetlands outside of New England, but occurs almost always in non-wetlands in New England (probability > 99%).

urceolate

Urn-shaped and constricted just below the apex, such as a blueberry flower.

utricle

A specialize type of achene that is a small, thin-walled, one-seeded fruit in which the outer mature layer (pericarp) is inflated or easily separable from the seed.