Re: Nepenthes Pollen

Clinton Morse - EEB Greenhouse Manager (EBGADM01@UCONNVM.UCONN.EDU)
Thu, 10 Nov 1994 08:31:37 -0400

To Joe N. & others: One of the goodies I have made available on our
Greenhouses World Wide Web Pages are detailed Angiosperm family descriptions
reproduced with permission from:

FAMILIES OF FLOWERING PLANTS L. Watson and M. J. Dallwitz 9 July 1993
as provided with Angio, an angiosperm family ID package for use
with the INTKEY program. This program and associated data files are
available for downloading via FTP from

I have enclosed a portion of the Nepenthaceae listing inthe hopes that it
answers your pollen question. Those of you with WWW access can see the
entire document along with all the other Angiosperm families at our WWW site
listed below (shameless plug)

Dioecious. Entomophilous.

Flowers aggregated in `inflorescences'. The terminal inflorescence unit
cymose, or racemose. Inflorescences racemes and thyrses. Flowers ebracteate;
ebracteolate; small; fragrant; regular; cyclic.

Perianth sepaline; (3-)4; free; 2 whorled (2+2, according to Airy Shaw);
usually isomerous. Calyx (if the perianth regarded as such) (3-)4; 2 whorled;
usually polysepalous, or gamosepalous (sometimes?). Degree of gamosepaly,
maximum length joined/total calyx length 2. Calyx regular; imbricate.

Fertile stamens present, or absent (in female flowers). Androecium
(4-)8-25. Androecial members free of the perianth; coherent; 1 - adelphous
(the filaments united into a column). Androecium exclusively of fertile
stamens. Stamens (4-)8-25; isomerous with the perianth to polystemonous.
Anthers dehiscing via longitudinal slits; extrorse; tetrasporangiate. Pollen
shed in aggregates; in tetrads. Grains indistinctly aperturate to
nonaperturate; 2-celled.

Gynoecium (3-)4; syncarpous; eu-syncarpous; superior. Ovary (3-)4
locular. Styles 1 (very short _the stigma almost sessile); very much shorter
than the mature ovary. Stigmas 1; capitate to subpeltate; dry type; papillate;
Group II type. Placentation axile (with many rows). Ovules 9-50 per locule
(`many'); ascending; non-arillate; anatropous; bitegmic; crassinucellate.
Outer integument contributing to the micropyle. Embryo-sac development
Polygonum-type. Polar nuclei fusing prior to fertilization. Antipodal cells
formed; 3; not proliferating. Synergids pear-shaped.

Fruit non-fleshy (leathery); dehiscent; a capsule. Capsules loculicidal.
Fruit 20-100 seeded (`many'). Seeds endospermic. Endosperm oily (and starchy).
Seeds filiform; winged (usually, with a narrow or hairlike wing at either
end), or wingless (Aneurosperma). Seeds with starch. Embryo well
differentiated (very short). Cotyledons 2. Embryo straight.

Please note that I am not a botanist and a botanical dictionary is very
handy when using these highly technical description....Later...Clint....
Clinton Morse - Greenhouse Manager
Department of Ecology & Evolutionary Biology
University of Connecticut, Storrs CT 06269
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