Other common names include dryland cress, cassabully, and American watercress. Some common winter annuals include henbit, deadnettle, chickweed, and winter cress. Plant development has focused on the thale cress "Arabidopsis thaliana" as a model organism. Other notable plants include Bristol rock cress, Bristol onion, spiked speedwell, autumn squill and honewort. "Arabidopsis thaliana" ("thale cress") is a much-studied model for vernalization. Changes in thale cress are easily observed, making it a very useful model. It includes familiar species such as garden cress, maca, and dittander. The spring ephemeral plant mouse-ear cress is a well-known example. Common names include lilacbush, purple rock cress and rainbow rock cress. Threatened plants include the Slender Mouse-Ear Cress ("Halimolobos virgata"). At 22, he married Barbara Cress, daughter of Dr. and Mrs. Henry Cress of Chicago. Welsing was born Frances Luella Cress in Chicago on March 18, 1935. Cultivation of garden cress is practical both on mass scales and on the individual scale. He withdrew his men to Cress Ridge. The third book, "Cress", is based on Rapunzel.