Rue Of The Mountains

Thamnosma texana (A. Gray) Torr. Bot. Mex. Bound Stirv. 42. 1859. Rutosma texana A. Gray, Gen. 111. 2 : 144. 1849.
A low partially herbaceous undershrub, 1-5 dm. tall, with slender, erect or spreading stems; leaves linear-oblong or filiform-linear, 5-15 mm. long, entire, sessile; flowers in terminal, interrupted racemes; sepals ovate to oval, obtuse or retuse, somewhat unequal; petals oval or elliptic, 3-5 mm. long, 2-3 mm. broad, greenish-yellow or whitish, often tinged with purple ; stamens shorter than the petals ; filaments subulate ; anthers oval or round, apiculate ; ovary sessile ; style not exserted ; capsule coriaceous, sessile or ver.v shortstipitate, lobed nearly to the middle, 3-7 mm. high; seeds reniform, flattened, tuberculate, 1.5-2 mm. long ; embryo curved ; cotyledons linear.
Type locality : Western Texas.
Distribution: Colorado to Texas, Arizona, and northern Mexico.

Thamnosma texana, the rue of the mountains, Texas desert-ru or Dutchman's breeches,is a shrub in the citrus family Rutaceae. It is native to Arizona (Hualap Mountains) to Texas and Northern Mexico.