Rock Penstemon. Penstemon baccharifolius, Snapdragon or Figwort Family: ( Scrophulariaceae ), Rock Penstemon. Also called: Baccharis - Leaf Beardtongue, Shrubby Penstemon, Del Rio, Baccharisleaf Beardtongue. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. A low evergreen shrub, or herbaceous perennial. Provides a good supply of nectar that hummingbirds love to feed upon. Rock penstemon can survive cold winter nights that go as low as 10 Fahrenheit. Full sun to partial shade is best for growing this plant. It does well in well drained soils. Quick Notes: Height: About 1 1/2 to 3 feet in height. 1 to 2 feet wide. Flowers: The flower is scarlet red, tubular corolla; the upper lip 2-lobed, the lower lip 3-cleft. , funnel-shaped, with short round lobes. The corolla is about 3/4 inch long, glandular and hairy on the outside. It has a broad upper corolla with a 2 - lobed lip, bent upward. The lower corolla lip is 3 - lobed and bent downward. There are 5 stamens, the fifth is sterile but bearded at the tip. Blooming Time: February - May. Stalk: Inflorescence glandular - pubescent. Leaves: Green to blue - green, fleshy, about 2 - 5 inches long, lanceolate, without stalks, smooth, those at the midstem are broadest at the base. Opposite, leaf margin minutely toothed at tips, leaves sessile. Found: The USDA claims it is native to the USA (TX). It is found in Texas on the Edward's Plateau, and & on the Trans-Pecos. Also found native to Mexico in the state of Chihuahua. Elevation: Native elevation about 100 to 3,000 feet in Texas. Hardiness: 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) Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) Sun Exposure: Full Sun Partial Shade Habitat: Yellowish clay, to clay loam surface soil; which quickly turns into rocky clay endemic to the Edwards Plateau in Texas. Miscellaneous: Photos Taken May 12, 2008. Peoria, Arizona Xeriscape Demonstration Garden.

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