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Kali tragus, the Russian thistle Leaves of a mature plant coming into flower, each leaf with one flower and two bracts in its axil. Salsola tragus is an annual forb.In habit, the young plant is erect, but it grows into a rounded clump of branched, tangled stems, each one up to about a metre long.
The flowers have five petals and are usually white or purple with yellow centers, though there is a blue variant that resembles the tomato flower. The fruits are berries that resemble tomatoes . The immature fruit is dark green with light green stripes, turning yellow and wrinkled as it matures.
Some larvae tunnel through the upper stem instead of chambering in a flower head; this can also be destructive to the plant. Adults do some damage as well when they feed on the foliage. Thistles which reproduce only via seed, such as musk thistle , are controlled well by this weevil and its seed head destroying larvae.
The flowers are usually dioecious, but not invariably so, with some plants bearing hermaphrodite flowers. [20] The seeds are 4–5 mm long, with a feathery pappus which assists in wind dispersal. [ 26 ] [ 27 ] [ 28 ] One to 5 flower heads occur per branch, with plants in very favourable conditions producing up to 100 heads per shoot. [ 14 ]
Thomas Nuttall (1786-1859) described var. megacanthum as "one of the most terribly armed plants in the genus." [ 8 ] [ 9 ] Cirsium horridulum is a biennial herb up to 250 centimetres (100 in) tall, with a large taproot and fleshy side roots that sometimes sprout new shoots.