Download Phylogeny and Classification of the Orchid Family by Robert L. Dressler, Kerry Dressler PDF

By Robert L. Dressler, Kerry Dressler

Recipient of the 1994 Henry Allan Gleason Award of the recent York Botanical backyard, this significant booklet delimits numerous significant ordinary teams in the orchids, suggesting parts that want extra study via botanists.Published at $49.95 Our final copies on hand at $24.98

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There is one frustrating problem with the silica cells. If a group lacks silica cells, one cannot know which type of silica cell the group (or its ancestor) has lost. POLARITY. As the spherical silica bodies correlate well with other features, they are considered derived.  (B) Of Cleisostoma subulatum (spherical). ) Inflorescence The orchid inflorescence is normally racemose, or indeterminate; the flowers are axillary on the rachis and usually flower from the base upward (Fig. 2-8A). Inflorescences may be branched (paniculate), in which case the ultimate branches are usually racemose (B).

It is customary to say that the orchids show great diversity in flower structure but their vegetative features are monotonously uniform. Benzing (1986a,b) maintains, on the contrary, that flower structure is relatively stereotyped, while plant structure is remarkably diverse. Few other plant families match the vegeta- Page 9 tive diversity of the orchids. Flower structure is rather uniform in number and arrangement of parts, but there is great diversity in size and structural details. Conventional wisdom also holds that the orchids are highly specific in their pollination relationships, implying that most orchid species are limited to single pollinator species.

If a group lacks silica cells, one cannot know which type of silica cell the group (or its ancestor) has lost. POLARITY. As the spherical silica bodies correlate well with other features, they are considered derived.  (B) Of Cleisostoma subulatum (spherical). ) Inflorescence The orchid inflorescence is normally racemose, or indeterminate; the flowers are axillary on the rachis and usually flower from the base upward (Fig. 2-8A). Inflorescences may be branched (paniculate), in which case the ultimate branches are usually racemose (B).

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