Type location:
Seward CO., Kansas About 6 miles north of Liberal.

Type specimen: MCKELVEY 2842 from about 6 miles north of Liberal, Seward Co., Kansas, May 31.1931, Arnold Arboretum Herbarium.

Basionym:
Yucca glauca var. stricta Sims 1821.

Synonym:
Yucca stricta Sims, Curtis's Bot. Mag. 48. plate 2222 (1821)
Yucca angustifolia var. stricta Baker,  Journal. Linn. Soc. Bot. 18:227 (1880)
Yucca angustifolia fa. stricta (Sims), Voss, Vilmorin Blumengarten (ed. 3) 1:  1057 (1895)
Yucca glauca var. stricta (Sims), Trelease  Annual Report Missouri Bot. Gard. 13:61, tt 25,26,27( 1902)
Yucca glauca var. gurneyi McKelvey, Yuccas SW U.S.  2: 169-173, t.61 (1947)
Yucca glauca ssp. stricta (Sims) Hochstatter, Cactaceae-Review IRT 1 (2):  21 (1998)

Distribution:
North East New Mexico, South Eastern Colorado, South West Kansas and in North West Oklahoma (Texas Co.)

Short description of the species:
Acaulescent or with prostate short stem (30-60 cm) the plants can be huge clumps up to almost 300 cm in diameter, such a large plant may have 10 or more rosettes of leaves; Leaves narrow linear, 55 to 70 cm long, 7 to 13 mm wide, grayish or glaucous green, with a narrow white edge, with few fibers (some forms has many fibers along the edge!) Flowers pendulous (bell shaped) greenish white, 6 to 7 cm long in large branched 100 to 180 cm tall panicle, the lower branches are 15 to 20 cm long those above are 30 cm long, and the upper most are 10 cm long. Seeds glossy, more than 12 mm long.

Hardiness:
Here in Northern Denmark Yucca glauca ssp. stricta is quite hardy, but after a very wet winter some of my plants did root in the center, but will recover from the rhizome. None of my plants has bloomed yet, but maybe this year?

Reference:
BAKER, (1880) Journal. Linn. Soc. Bot. 18:227 (Yucca angustifolia var. stricta)
SIMS, (1821) Bot. Mag. 48. plate 2222 (Yucca stricta)
TRELEASE, (1902), Annual Report Missouri Bot. Gard. 13:61, tt 25,26,27  (Yucca glauca var. stricta)
MCKELVEY, Yuccas SW U.S.  2:  169, t.61 (1947) (Yucca glauca var. gurneyi )
HOCHSTAETTER, F., Cactaceae-Review IRT 1 (2):  21 (1998) (Yucca glauca ssp. stricta)
HOCHSTAETTER, F.,Yucca In the Southwest and Midwest of the USA and Canada, vol. 1: 53-54 (2000)
HOCHSTAETTER, F.,Yucca In the Southwest and Midwest of the USA and Canada, vol. 1: 200 (2000)

My own plants:
#779       Yucca glauca ssp. stricta, Liberal area, Kansas Plains, 900 m, fh. 515, sown 1997
#1014     Yucca glauca ssp. stricta, New Mexico, Clayton, DJF1657, sown 1998, MG 1991.13
#1214     Yucca glauca ssp. stricta, New Mexico, Clayton, DJF1657, sown 1999, MG 1991.13
#455       Yucca glauca ssp. stricta Torrance Co., New Mexico, DJF 956.25, sown 1992
#455A    Yucca glauca ssp. stricta, New Mexico, Torrance Co., DJF956.25 sown 1992, leaves 4-5 mm wide
#455B    Yucca glauca ssp. stricta, New Mexico, Torrance Co., DJF956.25 sown 1992
#696      Yucca glauca ssp. stricta, New Mexico, Torrance Co., sown 1995, seeds from Christa's Cactus
#1113    Yucca glauca ssp. stricta, Texas Dallam Co., 1500 m, fh1178.8, sown 1999.

Pictures:
I don't have any pictures of Yucca glauca ssp. stricta in bloom, but if anyone has pictures that I may use, please let me know I would be very happy to use them.
 

696 Yucca glauca ssp. stricta, Torrance Co., New Mexico. Sown 1995. Photo August 2003	696 Yucca glauca ssp. stricta, Torrance Co., New Mexico. Sown 1995 Photo April 2009	696 Yucca glauca ssp. stricta, Torrance Co., New Mexico. Sown 1995. Photo April 2009