FloraFinder.org
Home   About Us   Want to Help?   FAQ  
Searching   Image Use Biblio

Yucca


 
KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassLiliopsidaMonocots (plants with a single seed leaf); includes the lily family
SubclassLiliidaeIncludes lilies, orchids, and many others
OrderAsparagalesA diverse group that includes asparagus
FamilyAsparagaceaeAgaves, asparagus, hyacinths, and others
GenusYuccaLinnaeus mistakenly derived the genus name from the Carib word for (similar-appearing) cassava, yuca

About plant names...

It remains a mystery why Linnaeus chose the Carib word yucca, meaning the entirely dissimilar cassava plant (Manihot esculenta), for the genus Yucca. Yuccas used to be in the lily family, but have recently been found to be part of the agave family. Generally they have thick narrow straplike leaves that emerge from a common point at the base, looking like a tuft of very large grass. Most yucca leaves have springy, wiry white filaments, a distinctive characteristic. Sometimes they have thick stems, making them tree-like. A tall central spike emerges from the leaves, covered with large, attractive flowers. Although most yuccas are adapted to hot, dry climates, some are comfortable in temperate climates too.

The yuccas on this page have not yet been identified.

Some yuccas are acaulescent: they have no stems, and the leaves grow directly from the ground. Others are small trees with stout, sometimes branched, trunks. Here is a comparison of the stemless yuccas presently in the database:

 

Yucca

(Yucca) · 2/26/2010 · San Diego Zoo, San Diego, Cali­fornia Species not yet identified

Yucca

(Yucca) · 5/2/2007 · By Rhonda Tatiana Schorer Species not yet identified

 
Yucca arkansana

Yucca baccata

Yucca filamentosa
Common Name

yucca

banana yucca

Adam’s needle
Plant Foliage up to 24" (60 cm); up to 7' (2.1 m) with the flower stalk

Yucca 


Up to 4' (1.2 m) × 4' (1.2 m)
30" (76 cm) tall × 30" (76 cm) wide
Flowers Flowering spike is covered with numerous greenish-white or purplish urn-shaped hanging flowers, each with 3 petals Cream-colored, copious, 1½-3½" (3.8-8.9 cm) long, hanging downward like inverted urns, on a stalk 3-5' (1-1.5 m) tall Copious, downward-hanging urn-shaped flowers with sharply pointed petals on a stalk 3-8' (91-243 cm) tall
Leaves 16-28" (40-70 cm) long, wide at the base, narrowing toward the tips, like large grass blades, with white twisted wiry filaments. They are bluish- to yellowish-green 12-40" (30-101 cm) long × 1-2" (2.5-5 cm) wide, blue-green, stiff, narrowing to sharp tips, emerging from a central base Medium green, swordlike leaves up to 3' (91 cm) long, emerging from a central point, with wiry white filaments
Seeds Dark brown seed capsules   Capsules are yellow-green to purple, about 1" (2.5 cm) long × ½" (1.3 cm) wide
Fruit   3-7" (8-18 cm) long × 2" (6 cm) across, cylindrical, sweet  
Range/ Zones

USDA Zones: 6a-9b

USDA Zones: 5-12

USDA Zones: 5-10
Habitats Open fields, edges of thickets on uplands Pinyon-juniper, sagebrush, mountain brush, or ponderosa pine, from 4921-8202' (1.5-2.5 km) in elevation  
Type Wild Wild Wild
Occurrence      

 

 
Yucca glauca

Yucca harrimaniae
Common Name

narrow-leaved yucca

spanish bayonet
Plant To 3' (1 m) high × 4' (1.2 m) wide In groups of one to twenty tufts, each about 12-39" (30-100 cm) around
Flowers 15-50 bell-shaped hanging flowers, greenish-white, with six petals, on a stalk 12-80" (30-203 cm) tall Urn-shaped, white, cream, or greenish white, sometimes tinged with purple, with purplish buds. 3 petals and 3 sepals. Flowers 1½-2" (4-6 cm) long × ⅝-1¼" (1.6-3.5 cm) wide
Leaves Pale green, stiff, sword-shaped leaves 8-40" (20-101 cm) long, up to ⅛-⅜" (6-12 mm) wide Tufts of stiff, narrow, sharp-pointed leaves 4-20" (10-50 cm) × ¼-½" (7-14 mm)
Seeds Cylindrical capsules up 1-1¾" (3-4.5 cm) long Cylindrical, 1¼-2" (3.5-6 cm) long × ½-1" (1.5-3 cm) in diameter
Range/ Zones

USDA Zones: 4a-10b

USDA Zones: 5a-10a
Habitats Dry plains and sandy hills Grassland, sagebrush, pinyon-juniper forest, on desert ridges and hills; 3281-8858' (1-2.7 km) elevation
Type Wild Wild
Occurrence Common Common

 

These yuccas are small trees:

 
Yucca elata

Yucca filifera

Yucca ×schottii (pro sp.)
Common Name

soaptree yucca

tree yucca

Joshua tree
Plant A small tree 4-15' (1.2-4.5 m) tall, with a thick brown trunk, sometimes branched, mostly covered in a skirt of dried leaves Up to 33-46' (10-14 m) in height, and a diameter of up to 9½' (3 m). They typically begin to branch out at a height of 9½-13' (3-4 m). Larger than most yuccas. A tree up to 20' (6.1 m) high, branched up to 6' (1.8 m) high.
Flowers White, bell-shaped, 1-2" (3-6 cm) long. Flowers are on a spike that emerges well above the leaves In clusters 4-6' (1.2-1.8 m) long are covered with cream-colored flowers. White or cream-colored, up to 1¾" (5 cm) long. Each with 3 petals and 3 sepals.
Leaves In dense whorls at the top(s) of the trunk(s). Leaves are yellowish, leathery, 10-39" (25-100 cm) × ¹/₁₆-½" (2-13 mm) wide Clusters of sharp rigid straplike leaves emerge from the plant tops, interspersed with tough curly thin white filaments. Leaves are blue-green, forming clusters up to 3' (91 cm) in diameter. 18-36" (45-91 cm) long, blue- or gray-green, stiff, smooth, swordlike. Leaves lack filaments.
Seeds Capsules 1½-3" (4-8 cm) × ¾-1½" (2-4 cm)    
Range/ Zones

USDA Zones: 7-12

USDA Zones: 8-12

Habitats Dry, sandy plains, mesas and desert washes, desert grasslands   Hillsides and canyons, at 4000-7000' (1.2-2.1 km) elevation
Type Wild Wild Wild
Occurrence Common    

 

 
Yucca thompsoniana

Yucca ×schottii (pro sp.)
Common Name

beaked yucca

Joshua tree
Plant A small tree 6-12' (1.8-3.7 m) high and 6' (1.8 m) wide, with a trunk that is sometimes branched. Leaves emerge in a spherical shape from the tips of the trunk(s), with dead leaves forming a skirt Larger than most yuccas. A tree up to 20' (6.1 m) high, branched up to 6' (1.8 m) high.
Flowers White, round to bell-shaped, on 24-36" (60-91 cm) stalks above the leaf clusters White or cream-colored, up to 1¾" (5 cm) long. Each with 3 petals and 3 sepals.
Leaves Stiff, narrow, swordlike, 8-24" (20-60 cm) × ½" (1.3 cm). Leaf edges are hard, pale yellow, often with fine teeth 18-36" (45-91 cm) long, blue- or gray-green, stiff, smooth, swordlike. Leaves lack filaments.
Seeds 1-2" (3-6 cm) long × ⅜-¾" (1-2 cm) thick  
Range/ Zones

USDA Zones: 7b-11

Habitats   Hillsides and canyons, at 4000-7000' (1.2-2.1 km) elevation
Type Wild Wild

 

Online References:

Yucca on the Succulent Plant Page

Yucca on Wikipedia

Yucca on PlantSystematics.org

Yucca on Fritz Hochstätter's Yuccas and Agaves site

Yucca

(Yucca) · 5/2/2007 · By Rhonda Tatiana Schorer Species not yet identified

Yucca

(Yucca) · 5/2/2007 · By Rhonda Tatiana Schorer Species not yet identified

 

Yucca description by Thomas H. Kent, last updated 16 Sep 2020.

© FloraFinder.org. All rights reserved.


 

Yucca

(Yucca) · 5/2/2007 · By Rhonda Tatiana Schorer Species not yet identified

Yucca

(Yucca) · 5/25/2009 · Boyce Thompson Arboretum, Superior, Ari­zona
≈ 4 × 6½' (1.3 × 2.0 m) Species not yet identified