Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Guaiacum angustifolium is a species of flowering plant in the caltrop family, Zygophyllaceae. Common names include Texas Guaiacum, Texas Lignum-vitae, Soapbush and Guayacan. It is native to southern and western Texas in the United States and northern Mexico. Texas Lignum-vitae is a many branched shrub or small tree, reaching a height of 7 m (23 ft). This evergreen has a dense canopy and short lateral branches. Leaves are 1–3 cm (0.39–1.2 in) long, opposite and pinnately compound, with four to eight pairs of leaflets. The dark green, leathery, linear to linear-spatulate leaflets are 5–16 mm (0.20–0.63 in) long and 2–3 mm (0.079–0.12 in) wide. Leaflets fold themselves at night and when exposed to hot sunlight. The small blue to purple flowers are 12–22 mm (0.47–0.87 in) in diameter. They have five sepals, five petals around 1 cm (0.39 in) in length, and ten stamens. The blooming period lasts from March until September. The fruit is a flat, leathery capsule 1–2 cm (0.39–0.79 in) in diameter with one to two lobes, sometimes as many as four. Dehiscent locules contain a single shiny, bean-like seed that is usually bright red.

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