Subspecies, varieties and forma:
Yucca rostrata forma integra Trelease, Mo. Bot. Gard.
Ann. Rpt. 22:102, 1911. Probably a synonym!
Yucca rostrata forma viridis
Type location:
Monclova, Mexico.
Distribution:
Eastern Coahuila, Northern Chihuahua, Mexico, Brewster Co., Texas,
Trans Pecos area, west of Rio Grande, Texas, at 600 - 800 m.
Short description of the species:
Plants arborescent with 1 to 5 stems up to 350 cm tall and 18
to 32 cm thick, rosettes with many leaves, occasionally with up to 3 "branches"
towards the top. Leaves, grey-green to bluish-green, 25 - 60 cm
long, 1 to 1,5 cm wide, margin of the leaves yellow with short sharp "teeth's".
Inflorescens
paniculate, 100 to 150 cm tall. Scape
held high above the leaves
35 to 70 cm long. Branchlets many, 2 to 35 cm long.
Flowers
globose (round) to campanulate (bell shaped), 5 to 6,5 cm long, white.
Fruit
3,5 to 7 cm long, 1,8 to 2,5 cm thick.
Seeds black dull, 0,4 to
0,5 x 0,6 to 0,7 cm, without marginal wing.
Yucca rostrata is related to:
Yucca cernua, status not sure, maybe
a natural hybrid with genes from Yucca rupicola
or Yucca pallida?
Yucca reverchoni
Yucca rupicola
Yucca thompsoniana
Yucca pallida
Hardiness:
For Denmark is not known, but I have knowledge of two large plants
with a height of 275 cm 180 cm (9 ft. and 6 ft.) both are cultivated in
in Tulsa, Oklahoma, both have been in the ground for approximately 10 years,
and have survived -23°C (-11°F) with no damage or protection.
I also have had report of a plant from New Jersey, USA, that also have
been there for several years.
Notes:
If the plants rosette dies in a very cold winter, do not throw the
plant away, there are several reports from growers around the world, that
it might regrow from the roots.
My own plants of Yucca rostrata:
2266 Yucca rostrata bought in 2003, until spring 2009 it was grown in a 90 liter pot. Now it's planted inside the unheated greenhouse.
1016 Yucca rostrata, Texas Redford, s1998, MG 1999 blue leaves.
2220 Yucca rostrata, Mexico, Sierra del Carmen, MB810, s2009, from
Michael Bechtold.
2221 Yucca rostrata "Green form", Mexico, San Carlos, MB805, s2009,
from Michael Bechtold.
Pictures:
I do not have any pictures of this species i bloom, if you have a photo
that I may use please let me know
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Yucca rostrata in habitat.
Photo by J. R. Manhart ©1999
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This plant is at a house in the town Beach Haven West in the center
of New Jersey, USA.
It is about 9' tall and beautiful! It has been there for years and has an eastern exposure. Photo by Joe Thiel, New Jersey ©2001-2005 |
Yucca rostrata
Grown in Alexander Heim's garden in his Greece. Copyright 2008 Alexander Heim. |
Yucca rostrata
A beautiful specimen grown for years in Tim Behan's garden Massachusetts, U.S.A., USDA Zone 5-6. Copyright 2009 Tim Behan. |
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Yucca rostrata
at Jurupa Mountains Cultural Center in Riverside, California, USA. |
This plant was a donation recieved in 2002, to supplement their large collection which is more than 30 years old. the plant is estimated to be more than 150 years old! | Photo by Buck Hemenway ©2002
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Yucca rostrata in bud in the garden ofRuud Wouterson, The Netherlands
2008.
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Reference:
HOCHSTAETTER, F., Succulenta, Netherlands, Vol. 78 no. 5, 207-217,
Yucca (Agavaceae) part 5,
TRELEASE, in Mo. Bot. Gard. Ann. Rpt. 13: 68. 1902.
WEBBER, Agric. Monograph U.S.D.A. 17:22-23 (1953)
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