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MONSTROSITIES IN IRISES

BY

MR. A. GUILLAUMIN

[LECTURE PRESENTED 27 MAY, 1922]

....Monstrosities are found fairly frequently in Irises. Several were cited in the classic treatises on Teratology from Masters, Penzig, and Worsdell. Subsequently, Miss Armitage, Bliss, Lynch and Mottet observed several other instances among cultivated plants. (1)
They are found in all Iris sections, with the exception of the Evansias and Gynandiris, and in the botanical species as well as horticultural varieties. They are, however, more numerous in these last, which, contrary to the opinion of Miss Armitage, supports the conjecture that they may arise from hybridizing and culture.

RAMIFICATION OF THE INFLORESCENCE

....The inflorescence is normally in the form of a spike or a cluster. In 1902, in the fields of the firm of Vilmorin-Andrieux et Cie, Mottet observed some Iris germanica with branched inflorescences. These branches were either opposed, or opposite-decussate, which is to say that the plane of two opposed branches formed a right angle with the plane of the two branches located immediately above it.

VIRESCENCE AND COLORING OF THE BRACTS

....Miss Armitage directed our attention to the tendency of the scarious bracts of the species of the Iris pallida group to become partially green and described an Iris xiphioides in which the first lateral bract was green and furnished with a dark blue lateral appendage, the second and third were entirely blue and veined like small sepals, and the fourth was membranous, narrow, long, and slightly colored.

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(1) An important collection of herbarium specimens of Iris monstrosities was exhibited at the first meeting of the Conference by the firm of Vilmorin-Andieux et Cie.