DOGBANE FAMILY (Apocynaceae)
BLUE TEXAS STAR
Plants with milky juice; sepals usually 5; corolla tubular, 5-lobed; stamens usually 5, inserted on corolla tube and alternate with the lobes; ovary superior; fruit mostly of 2 spreading follicles.
Blue Texas Star. Texas Dogbane. Blue-Star (Amsonia texana) belongs to a group named in honor of Charles Amson, a colonial physician. The stems are usually unbranched, 8-12 inches high, and are covered with narrow linear leaves. Like that of other amsonias, the tubular throat is lined with white hairs. The name of twin-pods might be given to the amsonias. The numerous seeds are borne in two narrow, erect pods which are united at the base and split along the inner sides. The pods are 3-4 inches long. The plant is perennial, growing in low clumps on limestone hillsides of Texas. The plants in North Texas form a conspicuous bluish-green line on low hills, when the flowers bloom in late March and April.
The oleander, periwinkle, and vinca are well-known members of the dogbane family. They all have a milky sap which is quite poisonous in the oleander, Indian hemp, and others. “Bane” is the common word in Northern Europe for “murderer” and is applied to poisonous plants.