Seeds from this milkweed Asclepias augusgifolia Arizona milkweed. The colors are white to purplish white and grow 24-26 inches tall.  Hardy in zones 8-10.  The flowers are in umbels at the stem tips. Each flower is up to 1/2 inch across and has 5 reflexed petals and a hooded central column. The leaves are green, opposite, and linear to narrowly lance-shaped. The stems are erect.