The Barneby reed-mustard (Schoenocrambe barnebyi) is a small sparsely leaved, herbaceous plant with light purple flowers and darker purple veins on each of the petals. These plants are usually up to 9 inches tall, with exceptional plants reaching 15 inches in height. The stems are woody and have smaller green, half-inch long leaves alternating up the stem about half way from the base of the plant. The flowers are 0.4 inch long and 0.1 inch wide with 2 to 8 flowers at the end of the plant’s leafy stems.