achlamydeous

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Having no perianth, as the flowers of a willow.

from The Century Dictionary.

• In botany, without a floral envelop: an epithet applied to plants which have neither calyx nor corolla, and whose flowers are consequently naked, or destitute of a covering.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Bot.) Naked; having no floral envelope, neither calyx nor corolla.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective botany Naked; having no floral envelope, neither calyx nor corolla.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective not having a floral envelope or perianth