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Colorado hookless Cactus

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Colorado hookless Cactus

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Title	Colorado hookless Cactus
Alternative Title	Sclerocactus glaucus
Contact	mailto:nctcimages@fws.gov
Creator	Glenne, Gina
Description	The Colorado hookless cactus is a barrel shaped cactus that ranges from 1.2 to 4.8 inches (in.) (3 to 12 centimeters (cm)) tall, with exceptional plants up to 12 in. (30 cm) tall. Stems range from 1.6 to 3.6 in. (4 to 9 cm) in diameter. The stems have 8 to 15 (typically 12 or 13) ribs that extend from the ground to the tip of the plant. Along the ribs are areoles (small, cushion-like areas) with hooked spines radiating out (Heil and Porter 2004). There are two types of spines, radial and central, defined by the size and position on the plant (see Figure 1) (74 FR 47112, September 15, 2009). The 2 to 12 radial spines are located around the margin of the areole, extending in a plane parallel to the body of the plant. The radial spines are white or gray to light brown. They are up to 0.67 in. (17 millimeters (mm)) long, and less than 0.04 in. (1 mm) in diameter. The one to five central spines (usually three) are 0.5 to 2.0 in. (12 to 50 mm) long, are generally longer than radial spines, and extend from the center of the areole. The central spines include abaxial and lateral forms. Abaxial spines are typically single, point toward the top of the plant, and are noticeably bent at the tip at an angle usually less than 90 degrees. Lateral spines are usually present in pairs on either side of the abaxial spine, but are more or less straight and diverge from the abaxial spine at an acute angle (usually 20 to 50 degrees).The flowers are usually funnel-shaped, but sometimes bell-shaped. They usually have pink to violet tepals (petal-like flower parts not differentiated into petals and sepals) with yellow stamens (the male reproductive organ of the flower), and are 1.2 to 2.4 in. (3 to 6 cm) long and 1.2 to 2 in. (3 to 5 cm) in diameter (74 FR 47112, September 15, 2009). The fruit is short, barrel-shaped 0.31 to 0.47 in. (8 to 12 mm) wide, and 0.35 to 1.2 in. (9 to 30 mm) long.
FWS Resource Links	Please check species status at: http://ecos.fws.gov/speciesProfile/profile/speciesProfile.action?spcode=Q21I
Subject	Plants Endangered and/or Threatened species
Location	Colorado
Publisher	U.S. Fish and Wildlife Service
Date of Original	2009-05-14
Type	Still Image
Format	JPG
Source	NCTC Image Library
Rights	Public Domain
File Size	864317 Bytes
Height	1200
Width	1600
Color Space	RGB
Original Format	Image
Full Resolution File Size	864317 Bytes
Original Filename	Sclerocactus_glaucus_flowers_051409_Gina_Glenne.jpg
Full resolution	Volume264/Sclerocactus_glaucus_flowers_051409_Gina_Glenne.jpg http://digitalmedia.fws.gov/FullRes/natdiglib/Volume264/Sclerocactus_glaucus_flowers_051409_Gina_Glenne.jpg
Date created	2011-10-13
Date modified	2015-05-19