Common name: Blue Yucca, Denticulate-leaf Yucca
Yucca rigida.
Photo by Paul Rose, Birmingham, England, Copyright 2003-2005
Synonyms:
Yucca rupicola var. rigida Engelmann Trans. Acad. Sci. St. Louis,
3: 49. (1873). (only in part as the plants from Buffatello is Yucca
thompsoniana)
Subspecies, varieties and forma:
Non to my knowledge
Type location:
Mexico.
Distribution:
Mexico, (Chihuahua, Coahuila, Durango) on rocky and stony slopes among
shrubs in the desert at 1200 to 1500 altitude.
Short description of the species:
Plants arborescent with 1 to 3 stems up to 450 cm tall and 12
to 15 cm thick, none or few branches, rosettes with many leaves. Leaves,
linear slightly wider at the middle and canaliculate, bluish to yellowish
green, 40 - 60 cm long, from 1,2 up to 1,7 cm wide. Inflorescence
pubescent, 130 to 170 cm tall. Scape
held high above the leaves
30 to 70 cm long. ellipsoid to ovoid in shape. Branchlets
25 to 40
Flowers globose (round) to campanulate (bell shaped), 3
to 6 cm long, white. Fruit 3,5 to 7 cm long, 1,8 to 2,5 cm thick.
Seeds
black, dull, 0,4 x 0,7, thinner than 1 mm thick, with at small wing.
Hardiness:
I don't know how hardy this plant will be in Denmark, but it may probably
be hardy in an unheated greenhouse, if planted in a well drained
bed. As a fellow grower of exotic plants: Paul Rose, Birmingham, England
has a Yucca rigida that is grown outsides with no protection at
all in an open position in full sun, here it has taken -7C with no problems
whatsoever over several years. Paul Rose's Yucca rigida is planted
in a mix of 50% grit 50% clay soil. You should visit Paul Rose's
web
site for more photos of his fantastic exotic garden.
Related species:
Yucca rigida is very closely related to Yucca
reverchoni, Yucca rupicola, Yucca
pallida, Yucca rostrata and
Yucca
thompsoniana
Notes:
Yucca rigida is not only very related to Yucca
thompsoniana If you go to the location for the type specimen
for Yucca thompsoniana (Bufatello, near
Presidio del Norte, Rio Grande, Chihuahua, Mexico.) and what you will se
there is plants of what we today call Yucca rigida. Since Yucca
rigida was published first, then it does have priority as a species
rank, and the plant we call Yucca thompsoniana
is actually a unnamed species! Hopefully will Hochstätter have solved
this error in his next book the Yuccas of Mexico, which will be published
in 2004, or before in one of his many articles in the Dutch Journal Succulenta.
Pictures:
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Yucca rigida.
Photo by Paul Rose, Birmingham, England, Copyright 2003. |
Yucca rigida
In the garden of Steve Gange, Essex, UK. Copyright 2003 Steve Gange. |
Yucca rigida
Grown in Alexander Heim's garden in his Greece. Copyright 2007 Alexander Heim. |
I do unfortunately not have any pictures of this species i bloom or from habitat, if you have a photo that I may use please let me know
Reference:
Engelmann Trans. Acad. Sci. St. Louis, 3: 49. (1873). (only in part
as the plants from Buffatello is Yucca thompsoniana)
(Yucca rupicola var. rigida)
Matuda & Pinã Lujan (1980) Cact. & Journ. Amer. 52 (6)
pg. 277-281
TRELEASE, in Mo. Bot. Gard. Ann. Rpt. 13: 65, 1902.
TRELEASE, Mo. Bot. Gard. Ann. Rpt. 22:101, 1911(Yucca
thompsoniana)
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