S. C.  Kim and Crawford, D. J., ?ITS sequences and phylogenetic relationships in Bidens and Coreopsis (Asteraceae)?, Syst. Bot, vol. 24, no. 3, pp. 480 - 493, 1999.

S. J.  Mazer and Dawson, K. A., ?Phylogenetic relationships in the Caesalpinioideae (Leguminosae) as inferred from chloroplast trnL intron sequences?, Syst. Bot, vol. 26, pp. 487 - 514, 2001.

T.  Ohi-Toma, Sugawara, T., Murata, H., Wanke, S., Neinhuis, C., and Murata, J., ?Molecular phylogeny of Aristolochia sensu lato (Aristolochiaceae) based on sequences of rbcL, matK, and phyA genes, with special reference to differentiation of chromosome numbers?, Syst. Bot, vol. 31, pp. 481 - 92, 2006.

Y.  Suh and Simpson, B. B., ?Phylogenetic Analysis of Chloroplast DNA in North American Gutierrezia and Related Genera (Asteraceae: Astereae)?, Syst. Bot, vol. 15, no. 4, pp. 660 - 670, 1990.

C.  Alonso and Herrera, C. M., ?rbcL and legume phylogeny, with particular reference to Phaseoleae, Millettieae, and allies?, Syst. Bot, vol. 26, pp. 515 - 536, 2001.

C. R.  Hart, ?The systematics of the Bidens ferulaefolia complex (Compositae)?, Syst. Bot, vol. 4, pp. 130 - 147, 1979.

E. C.  Bess, Doust, A. N., Davidse, G., and Kellogg, E. A., ?Zuloagaea, a new genus of neotropical grass within the _bristle clade_ (Poaceae: Paniceae)?, Syst. Bot, vol. 31, pp. 656 - 670, 2006.

K. W.  Hilu and Alice, L. A., ?A phylogeny of the Chloridoideae (Poaceae) based on matK sequences?, Syst. Bot, vol. 26, pp. 386 - 405, 2001.

L. E.  Urbatsch, Baldwin, B. G., and Donoghue, M. J., ?Phylogeny of the coneflowers and relatives (Heliantheae: Asteraceae) based on nuclear rDNA internal transcribed spacer (ITS) sequences and chloroplast DNA restriction site data?, Syst. Bot, vol. 25, pp. 539 - 565, 2000.

L. M.  Kelly, ?Taxonomy of Asarum Section Asarum (Aristolochiaceae)?, Syst. Bot, vol. 26, pp. 17 - 53, 2001.

M. A.  Lane, ?Taxonomy of the genus Amphiachyris (Asteraceae: Astereae)?, Syst. Bot, vol. 4, pp. 178 - 189, 1979.

P. O.  Karis, ?Cladistics of the subtribe Ambrosiinae (Asteraceae: Heliantheae)?, Syst. Bot, vol. 20, pp. 40 - 54, 1995.

S.  Janssens, Geuten, K., Yuan, Y. M., Song, Y., Kupfer, P., and Smets, E., ?Phylogenetics of Impatiens and Hydrocera (Balsaminaceae) using chloroplast atpB-rbcL spacer sequences?, Syst. Bot, vol. 31, no. 1, pp. 171 - 180, 2006.