Yucca angustissima ssp.  kanabensis




#337C Yucca angustissima ssp. kanabensis
Utah, Kane Co., North Kanab, sown 1992, MG 1993.4

Yucca angustissima ssp. kanabensis (Mckelvey) Hochstaetter
Cactaceae-Review, Germany, 1 (2): 21, 1998.

Synonyms:
Yucca kanabensis Mckelvey, Yuccas of the south-western United States, Part two, 122-126, 1947.
Yucca angustissima var. kanabensis Reveal, Intermountain Flora, Vascular Plants of the Intermountain West, 534-536, 1977.

Clones and Hybrids:
Yucca angustissima ssp. kaibabensis intermediates westward with Yucca elata ssp. utahensis and eastward with Yucca angustissima.

Unpublished names:
Yucca glauca var. kanabensis, Mesa Garden seed list.

Type location:
8 miles northwest of Kanab, Utah.

Distribution:
Sandy soils in Sagebrush pine communities in Southern Utah and Northern Arizona, at 1300 to 2300 m in Kane Co., (Type from 8 miles NW of Kanab) and Washington Co. Utah. Occurs mainly from Zion Canyon east to Johnson Canyon, with the greatest concentration north west of Kanab, in the vicinity of the Coral Pink Sand Dunes.
Of other succulents Yucca angustissima ssp. kaibabensis is associated with Sclerocactus parviflorus, various Echinocereus spec., Opuntia spec.

Short description of the species:
Plants: acaulescent or short-caulescent, forming small to large clumps. Leaves: Linear, 45 to 80 cm long, 6 to 15 mm wide (occasionally 20 mm wide!), concavo-convex, stiff but flexible, the margin white, soon with strait or curled fibers. Inflorescens: mostly 150 to 300 cm tall, racemose or with 2-4 short branchlets, the short penducle and lower portion of inflorescens usually included among the leaves. Flowers: large, campanulata to globose, white to greenish-white or cream, often tinged purplish outside, the segments elliptic to nearly orbicular 55 to 65 mm long (occasionally only 40 mm!), 23 to 40 mm broad. Ovary: 20 to 30 mm long. Style: greenish, 5 to 8 mm long. Fruit: cylindrical, oblong, 65 to 75 mm long, sometimes constricted, roughened.

My own plants:
#337A Yucca angustissima ssp. kanabensis Utah Kane Co., N Kanab, sown 1992, MG 1993.4, long bluish leafs, many fibers.
#337B Yucca angustissima ssp. kanabensis Utah Kane Co., N Kanab, sown 1992, MG 1993.4, long bluish leafs, many fibers.
#337C Yucca angustissima ssp. kanabensis Utah Kane Co., N Kanab, sown 1992, MG 1993.4, long bluish leafs, many fibers.
#729    Yucca angustissima ssp. kanabensis ?, Navajo Co. 1600 m, Arizona, recieved as Yucca  sp. from  Henk De Looze, p1995.
#757    Yucca angustissima ssp. kanabensis Utah, small plant 1995 GBT
#1048  Yucca angustissima ssp. kanabensis Utah near Cedar City, 1900 m. fh 1179.15 sown 1999
#1114  Yucca angustissima ssp. kanabensis Utah Kane Co., 1850 m    fh 1178.5 sown 1999 FH
#1115  Yucca angustissima ssp. kanabensis Utah White Cliffs. 1800 m, fh 1179.17 sown 1999
#1116  Yucca angustissima ssp. kanabensis Utah Virgin River, 1660 m, fh 1179.18 sown 1999
#1117  Yucca angustissima ssp. kanabensis Utah Paria River, 1800 m, fh 1179.19 sown 1999

Hardiness:
I have grown this variety since 1992, and I have a large plant in a well drained raised bed with out any protection at all, so far it's OK, but the snow sometimes makes it look rather sad in the spring. I would expect it to look better if it was covered. the frost doesn't do a thing with this one....

Notes:
Yucca angustissima ssp. kaibabensis is one of our most striking species. The tall inflorescence, extending well above the leaves, short penducle (included within the leaves), and for long slender leaves are diagnostic in combination for this handsome plant.

Pictures:
 
Yucca angustissima ssp. kaibabensis
East of Kanab, Utah.
Photo by Craig Howe ©2000
#337C Yucca angustissima ssp. kanabensis
Utah, Kane Co., North Kanab, 
sown 1992, MG 1993.4
#337C Yucca angustissima ssp. kanabensis
Utah, Kane Co., North Kanab, 
sown 1992, MG 1993.4
#337C Yucca angustissima ssp. kanabensis
Utah, Kane Co., North Kanab, 
sown 1992, MG 1993.4
#337C Yucca angustissima ssp. kanabensis
Utah, Kane Co., North Kanab, 
sown 1992, MG 1993.4
#337C Yucca angustissima ssp. kanabensis
Utah, Kane Co., North Kanab, 
sown 1992, MG 1993.4
#337C Yucca angustissima ssp. kanabensis
Utah, Kane Co., North Kanab, 
sown 1992, MG 1993.4
#337C Yucca angustissima ssp. kanabensis
Utah, Kane Co., North Kanab, 
sown 1992, MG 1993.4

Reference:
HOCHSTAETTER, Cactaceae-Review, Germany, 1 (2): 21, 1998.
HOCHSTAETTER, Het geslacht Yucca (2), Succulenta, 78(1), 28-33, 1999
HOCHSTAETTER, Yucca (Agavaceae) CD-rom no. 3, 1999.
MCKELVEY, Yuccas southwest. U.S. 2:122-126 (1947) (Yucca kanabensis)
REVEAL, Intermountain Flora, Vascular Plants of the Intermountain West, 534-536, 1977, USA.
WEBBER, Agric. Monograph U.S.D.A. 17:62-65 (1953) (Yucca kanabensis as a possible syn for Yucca glauca x Yucca elata)



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