
1) Chlamys 2) Cover 3) Covering 4) Floral envelope 5) French word used in English 6) Natural covering 7) Outer parts of a flower 8) Perigone 9) Perigonium 10) Plant organ 
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https://www.crosswordclues.com/clue/perianth

1) Chlamys 2) Perigone 3) Perigonium 
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https://www.crosswordclues.com/clue/perianth

the collective terms for the calyx and corolla of a flower (generally used when the two are similar).
Found on 
http://en.wikipedia.org/wiki/Glossary_of_botanical_terms

 The perianth (sometimes called perigonium or perigon) is the non-reproductive part of the flower, and structure that forms an envelope surrounding the sexual organs, consisting of the calyx (sepals) and the corolla (petals). The term perianth is derived from the Greek peri, meaning around, and anthos, meaning flower, while perigonium is derived fr...
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http://en.wikipedia.org/wiki/Perianth

the outer floral whorl or whorls of a monocotyledonous flower, sometimes divisible into outer and inner perianth segments. Sometimes used by other authors to describe the floral whorl of a dicotyledonous flower when it is uncertain if the whorl is calycine or corolline in origin or used as a collective term for calyx and corolla
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http://florabase.dpaw.wa.gov.au/help/glossary

single term for the calyx and corolla
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http://orchidfetish.com/glossary.html

• (n.) The leaves of a flower generally, especially when the calyx and corolla are not readily distinguished. • (n.) A saclike involucre which incloses the young fruit in most hepatic mosses. See Illust. of Hepatica.
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http://thinkexist.com/dictionary/meaning/perianth/

A collective term for the petals and sepals of a flower, in orchids this does not include the labellum.
Found on 
http://www.anbg.gov.au/cpbr/cd-keys/orchidkey/html/glossary.html

(from the article `angiosperm`) ...calyx. Petals are the next layer of floral appendages internal to the calyx; they are generally brightly coloured and collectively are called the ... The flower of the Magnoliales typifies one of the early lines of floral evolution. The early flowers consisted of an axis with many floral parts ... T...
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http://www.britannica.com/eb/a-z/p/44

(from the article `bryophyte`) In many leafy liverworts the archegonia are often enclosed by a protective sleeve, the perianth, and have mucilage hairs among them with a function ...
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http://www.britannica.com/eb/a-z/p/44

a collective term for the calyx and corolla
Found on 
http://www.calflora.net/botanicalnames/botanicalterms.html

In angiosperms (flowering plants), the petals and sepals taken together. The term comes from the Greek peri for 'around' and anthos for 'flower'.
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http://www.daviddarling.info/encyclopedia/P/perianth.html

<plant biology> The calyx and corolla of a flower, especially where the two are similar. ... (09 Oct 1997) ... 
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http://www.encyclo.co.uk/local/20973

a collective term for the calyx and corolla
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http://www.encyclo.co.uk/local/21767

The floral envelope, consisting of the sepals and petals if both are present, or either of them if the other is absent.
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http://www.encyclo.co.uk/local/22034

All the sepals and petals of a flower.
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http://www.encyclo.co.uk/local/22037

All the sepals and petals of a flower.
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http://www.encyclo.co.uk/local/22038
 Per'i·anth  noun
Per'i·anth  noun [ Prefix 
 peri- + Greek ... flower: confer French 
 périanthe .] 
 (Botany)  (a)  The leaves of a flower generally, especially when the calyx and corolla are not readily distinguished. 
 (b)  A saclike involucre which incloses the young fruit in most hepatic...
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http://www.encyclo.co.uk/webster/P/54

The floral envelope considered together; commonly used for flowers in which there is usually no clear distinction between calyx and corolla, as the lilies.
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http://www.gardenology.org/wiki/Glossary_of_Gardening_Terms

single term for the calyx and corolla
Found on 
http://www.orchidspecies.com/glossary.htm

In botany, the perianth is the outer floral envelope - calyx and corolla - which surrounds and to some extent protects the essential organs of generation in a flower. As a rule it consists of an outer layer of greenish parts called sepals, and an inner layer of brightly coloured parts called petals; but sometimes one or other of these layers is mis...
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http://www.probertencyclopaedia.com/browse/BP.HTM

The sepals and petals of a flower are together called the perianth; literally 'around the anthers'. More info?
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http://www.ucmp.berkeley.edu/glossary/glossary_8.html

perianth The outer envelope of a flower, consisting of either the calyx (sepals of one flower collectively) or the corolla (petals of a flower collectively), or both.
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http://www.wordinfo.info/words/index/info/view_unit/148/6
 chlamys noun
chlamys noun collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils
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https://www.encyclo.co.uk/local/20974

In botany, a collective term for the outer whorls of the flower, which protect the reproductive parts during development. In most dicotyledons the perianth is composed of two distinct whorls, the calyx of sepals and the corolla of petals, whereas in many monocotyledons the sepals and petals are indistinguishable and the segments of the perianth are...
Found on 
https://www.encyclo.co.uk/local/21221
  No exact match found.