Helianthus

Sivinski, R. 2010. Email with Map to Rayo McCollough on Status of Pecos Sunflower (Helianthus paradoxus) Seeding/Reintroduction on the Rhodes property north of San Antonio. 1 p.

Riesenberg, L.H., R. Carter, and S. Zona. 1990. Molecular tests of the hypothesized origin of two diploid Helianthus species (Asteraceae). Evolution 44(6): 1498-1511.

• Helianthus

Heiser, C.B., Jr., with D.M. Smith, S.B. Clevenger, and W.C. Martin, Jr. 1969. The North American sunflowers (Helianthus). Memoirs of the Torrey Botanical Club 22(3). 218 pp.

• Asteraceae
• Helianthus

Heiser, C.B., Jr. 1958. Three new annual sunflowers (Helianthus) from the southewestern U.S. Rhodora 60: 272-274.

• Helianthus