Huachuca Mountain Rocktrumpet.
Macrosiphonia brachysiphon, Dogbane Family: ( Apocynaceae ) , Huachuca Mountain Rocktrumpet. Also called: Telosiphonia brachysiphon, Rock Trumpet.

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The Huachuca Mountain Rocktrumpet is an erect, evergreen Subshrub, usually roundish, which develops a short stem with a small crown. Its leaves are green, opposite, puberulent, broadly ovate to elliptic, and about 3/4 to 1 1/4 inch long, and 1/4 to 3/4 inch wide.

Macrosiphonia brachysiphon flowers are white, trumpet shaped and about 2 - 3 inches long and about 1 1/2 inches wide.

It has 2 follicle fruits which are about 5 inches long and covered in red - copper colored hairs. Thes seeds are slightly red, puberulent, and flat, with the margins folded in.

Quick Notes:

Height: Up to 24 inches tall. Spreads up to 3 feet wide.

Flowers: White, trumpet shaped and about 2 - 3 inches long and about 1 1/2 inches wide.

Flowering Time: Late March - November. Best Bloom is April - August.

Fruit: It has 2 follicle fruits which are about 5 inches long and covered in red - copper colored hairs. Thes seeds are slightly red, puberulent, and flat, with the margins folded in.

Leaves: Leaves are gray - green, opposite, puberulent, broadly ovate to elliptic, 3/4 to 1 1/4 inch long, 1/4 to 3/4 inch wide.

Found: Native of the USA (AZ, NM, TX). Also found in Northern Mexico: Chihuahua, & Sonora. Found in Southeastern Arizona.

Hardiness:
USDA Zone 3a: to -39.9 �C (-40 �F)
USDA Zone 3b: to -37.2 �C (-35 �F)
USDA Zone 4a: to -34.4 �C (-30 �F)
USDA Zone 4b: to -31.6 �C (-25 �F)
USDA Zone 5a: to -28.8 �C (-20 �F)
USDA Zone 5b: to -26.1 �C (-15 �F)
USDA Zone 6a: to -23.3 �C (-10 �F)
USDA Zone 6b: to -20.5 �C (-5 �F)
USDA Zone 7a: to -17.7 �C (0 �F)
USDA Zone 7b: to -14.9 �C (5 �F)
USDA Zone 8a: to -12.2 �C (10 �F)
USDA Zone 8b: to -9.4 �C (15 �F)
USDA Zone 9a: to -6.6 �C (20 �F)
USDA Zone 9b: to -3.8 �C (25 �F)
USDA Zone 10a: to -1.1 �C (30 �F)
USDA Zone 10b: to 1.7 �C (35 �F)
USDA Zone 11: above 4.5 �C (40 �F)

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)

Sun Exposure:
Full Sun

Elevation: Usually at 3,700 to 5,800 feet. Can be found from 0 to 5,900 feet.

Habitat: Rocky slopes and plains, found in desert grassland, often found on limestone.

Miscellaneous: Excellent Xeriscape Landscaping Plant. Flowering Photos Taken April 19, 2008. Arizona-Sonora Desert Museum. Hardy to 15�C.