Common names: JIMMYWEED, RAYLESS-GOLDENROD, GOLDENBUSH, GOLDENWEED Arizona desert: (_Aplopappus lacrifolius_). Yellow. August-November. California desert: (_Aplopappus gracilis_). Yellow. February-November. Texas-New Mexico desert: (_Aplopappus heterophyllus_). Yellow. June-September. Sunflower family. Size: Herbs or small shrubs 2 to 18 inches. The genus _Aplopappus_ (sometimes spelled _Haplopappus_) is represented in the Southwest by a great many species, both annuals and perennials, which range from elevations of 2,000 feet up to 9,000 feet. Desert forms prefer open, dry canyon slopes and mesas. _A. linearifolius_ is conspicuous in the springtime, at elevations between 3,000 and 5,000 feet because of its many, showy flower heads. _A. heterophyllus_ often takes over heavily grazed rangeland since it is generally unpalatable to livestock and replaces vegetation destroyed by overgrazing. YELLOW [Illustration: Psilostrophe cooperi] Common name: PAPERFLOWER Arizona and Texas deserts: (_Psilostrophe cooperi_). Bright yellow. Year around. Texas-New Mexico deserts: (_Psilostrophe sparsiflora_). Bright yellow. May-September. Sunflower family. Size: Rounded bush 12 to 18 inches high. One man of the writer’s acquaintance, confused by the great number of yellow flowers on the desert, refers to them all as “yellow composites.” The Paperflower is one of these. It is noticeable because of the conspicuous, bright yellow flowers which sometimes cover the plants almost completely, often during periods of the year when bloom is quite scarce on the desert. The flowers are persistent, petals become papery, fade to a pale yellow, and remain on the plants intact for weeks. Although the Paperflower does not form great masses of color, the blossom-covered clumps are conspicuous among the Cactus, Mesquite, and Creosotebush of the desert. It is common at elevations below 5,000 feet from southern Utah to Lower California, with similar species ranging eastward through southern New Mexico and northern Chihuahua. Some species are reported to be poisonous to sheep. YELLOW [Illustration: Cassia lindheimeriana Cassia bauhinoides] Common names: DESERT-SENNA, RATTLEWEED Arizona desert: (_Cassia bauhinoides_). Yellow. May-August. California desert: (_Cassia armata_). Yellow. April-May. Texas desert: (_Cassia lindheimeriana_). Golden. June-September. Pea family. Size: Low, branching shrub up to 3 feet. Members of this large genus are chiefly tropical, the majority having golden to bronze flowers and brown, woody seed pods. They are quite common along desert roadsides, and a few species are cultivated as ornamentals.