The two most important investigators on agaves are Alwin Berger and Howard S. Gentry (see page Literature). Dr. Howard S. Gentry works at the Desert Botanical Garden at Phoenix , USA (http://www.dbg.org/). Apart from Berndt Ullrig (see Literature) other important investigators on agaves now are Dr. Abisaí García Mendoza (Exterior Botanical Garden of the Mexican National University and Dr. Raquel Galván Villanueva of the Mexican National School of Biological Sciences.
For information on habitat vs. species, or species vs. habitat see AgaveData > Habitat / Species (site ready as from 6/15/03). For information on hybrids see > Nomenclature..
For Texas agaves see: http://www.csdl.tamu.edu/FLORA/bonapfams/bonxxaga.htm
For crested agaves and agave twins see: http://public.fotki.com/maarten/5/oddities/
Twins have been seen, at least, in americana, deserti and parrasana neomexicana (all three Continental subgenus Agave).
There might be something the same in crested agaves and twin agaves. I had a mckelveyana seedling that definively was producing crested leaves. From the sixth leaf on, they were normal. Taken out of the soil one could see two instead of one first "leaf", then the three crooked twisted cristata leaves and after that the rest, being normal leaves.
URLs with herbarium pictures
&
These are some URLs of sites, in alphabetical order, that give interesting botanical information about agaves, also on hardiness.
Most important sites:
http://www.agavaceae.com
http://www.desert-tropicals.com/Plants/Agavaceae/ (Direct plant URL for f.e. Agave aktites: http://www.desert-tropicals.com/Plants/Agavaceae/Agave_aktites.html)
(Pictures, nomenclature, literature...)
(Yahoo group on agaves and related plants)
And, last but not least, the sites related to this one:
(Discussion)
and
(Pictures)
Flowering agaves:
See the attached album on the flowering of an Agave parrasana in the Netherlands (pictures will be added regularly). Copyright Peter van der Puyl, Den Burg, Netherlands 2001 & 2002. See file names for dates pictures were taken.
Interesting sites:
Agave in households as units of archaeological analysis
Desert Botanical Garden. Data about agaves collected in nature and agaves grown from plants collected in nature. (Question mark should be added to URL, which here is impossible.)
Other sites:
("The family Agavaceae in the Sonoran desert")
(Oasis Garden Design)
http://www.flamenewmedia.com/agave/listing.htm
http://florawww.eeb.uconn.edu/acc_num/198502673.html
http://www.users.globalnet.co.uk/~jankol/
http://www.succulent-plant.com/agave.html
http://nasa.utep.edu/chih/gardens/plants/agavneom.htm
http://www.zianet.com/snm/agaves.htm
http://madli.ut.ee/~jsild/agavacea.htm
Seed dormancy:
The Bibliography of References Related to Seed Dormancy and/or
Germination in Higher Plants
http://library.usask.ca/dbs/seed.html
Information in Spanish on http://www.rjbalcala.com/cact10.htm which is the site of the Botanical Garden Juan Carlos I. I will translate this information soon.
Please send me more information if you have so to AgaveWeb !
A. parrasana neomexicana twin
My pic, no copyright
Same plant, 6 months later
(a 4th offset cannot be seen on the pic)
Cresting?
