Agave americana 'Fine Art' - 'Fine Art' Century Plant - Hardy Succulent

Agave americana ssp. protoamericana - Hardy Succulent

Agave americana var. picta - variegated forms of Common Century Plant - Hardy Succulent,    gold-variegated forms tend to be hardiest.

Agave bracteosa - Hardy Succulent - Forms clustering rosettes of soft, flexible leaves with no spines.

Agave celsii - Also known as:  Agave mitis - Century Plant - Hardy Succulent - Buy only those grown from seed collected at high elevations.  Others will not be cold-hardy. 

Agave celsii var. albicans - Hardy Succulent - Looks best if grown in containers and protected from hard freezes.

Agave chrysantha - Century Plant - Hardy Succulent

Agave filifera ssp. schidigera - Also known as:  Agave schidigera - Century Plant - Hardy Succulent

Agave funkiana - Blue Lechuguilla - Hardy Succulent

Agave gentryi - Also known as:  Agave macroculmis - Century Plant - Hardy Succulent

Agave havardiana - Havard's Century Plant - Hardy Succulent

Agave lechuguilla - Lechuguilla - Hardy Succulent

Agave lophantha - Hardy Succulent

Agave montana - Century Plant - Hardy Succulent

Agave murpheyi - Century Plant - Hardy Succulent - Though said to be cold-tender, my 10-year-old plant is over 9' across and produces a large number of offsets.

Agave neomexicana - Also known as:  Agave parryi subspecies neomexicana - New Mexico Century Plant - Hardy Succulent

Agave obscura - Also considered by some to be a form of:  Agave polyacantha or Agave xalapensis - Century Plant - Hardy Succulent

Agave ovatifolia - Century Plant - Hardy Succulent - The recently-given name to a plant from the Sierra de Lampazos, Nuevo León, NE Mexico.  This gigantic species is spectacular and has been grown in Texas for many years.

Agave palmeri - Century Plant - Hardy Succulent

Agave parrasana - Hardy Succulent (if kept very dry) 

Agave parryi - Century Plant - Hardy Succulent

Agave parryi ssp. parryi forma truncata - Century Plant - Hardy Succulent - One of the most horticulturally attractive forms of this species.

Agave X phillipsiana - Thought to be a:  Agave palmeri X Agave americana var.expansa - Grand Canyon Hybrid Century Plant - Hardy Succulent - Hard to obtain since the "Endangered Feces " people have appropriated it.

Agave salmiana - Pulque Agave - Hardy Succulent

Agave salmiana var. ferox - Ornamental Pulque Agave - Hardy Succulent

Agave scabra - The correct name is proposed to be:  Agave asperrima - Rough-Leafed Century Plant - Hardy Succulent

Agave striata ssp. striata - Century Plant - Hardy Succulent

Agave striata ssp. striata 'Espadina' - Century Plant - Hardy Succulent - An especially large form from near Monclova, Coahuila, NE Mexico.

Agave striata ssp. stricta - Also known as:  Agave stricta - Century Plant - Hardy Succulent

Agave tenuifolia - Century Plant - Hardy Succulent

Agave victoriae-reginae (includes forms called Agave fernandi-regis) - Queen Victoria's Agave - Hardy 
Succulent

Agave victoriae-reginae X Agave scabra - Hybrid Agave - Hardy Succulent

Agave weberi - Weber's Century Plant - Hardy Succulent

Beschorneria septentrionalis - Perennial

Beschorneria (species and hybrids) - Perennial

Dasylirion texanum - Sotol - Hardy Succulent

Hesperaloe campanulata - Giant Pink Yucca - Hardy Succulent

Hesperaloe funifera - Hardy Succulent

Hesperaloe parviflora - Red Yucca - Hardy Succulent

Hesperaloe parviflora (yellow) - Yellow-flowered Red Yucca - Hardy Succulent

Manfreda maculosa - Perennial

Manfreda undulata - Perennial

Manfreda variegata - Perennial

Nolina lindheimeriana - Bear Grass - Shrub

Nolina nelsonii - Nelson's Nolina - Shrub

Nolina texana - Bear Grass - Shrub

Yucca carnerosana - Western Spanish Dagger - Shrub

Yucca constrica - Shrub

Yucca pallida - Shrub

Yucca rupicola - Twist-Leaf Yucca - Shrub

Yucca rupicola X pallida - Hybrid Twist-Leaf Yucca - Shrub

Yucca treculeana - Spanish Dagger - Shrub