Album Caption: Tetradymia spinosa Hook. & Arn. Family : Sunflower, Compositae. Flowers: Fleshy smooth heads of four yellow flowers 1/2 to 3/4 inch long arising from axils of the leaves. Bracts at base of heads woolly. Blooms from May to July. Leaves : Primary leaves converted to woolly recurved spines 1/4 to 1/2 inch long. Secondary leaves linear, 1/4 to 1/2 inch long, fleshy and in clusters. Plant : Divaricately branched xerophytic shrub 2 to 4 feet high with white woolly branches and characteristic recurved woolly spines which are soft and pliant when first produced. High potassium content in leaves and buds. Organic compound in plant poisonous to sheep. Published in U.S. Geological Survey Bulletin 1030-M, figure 146. 1957.
Summary
Album Caption:
Tetradymia spinosa Hook. & Arn. Family : Sunflower, Compositae. Flowers: Fleshy smooth heads of four yellow flowers 1/2 to 3/4 inch long arising from axils of the leaves. Bracts at base of heads woolly. Blooms from May to July. Leaves : Primary leaves converted to woolly recurved spines 1/4 to 1/2 inch long. Secondary leaves linear, 1/4 to 1/2 inch long, fleshy and in clusters. Plant : Divaricately branched xerophytic shrub 2 to 4 feet high with white woolly branches and characteristic recurved woolly spines which are soft and pliant when first produced. High potassium content in leaves and buds. Organic compound in plant poisonous to sheep.
Published in U.S. Geological Survey Bulletin 1030-M, figure 146. 1957.
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