Marina diffusa var. radiolata

  • Title

    Marina diffusa var. radiolata

  • Authors

    Rupert C. Barneby

  • Scientific Name

    Marina diffusa var. radiolata Barneby

  • Description

    33b.  Marina diffusa (Moricand) Barneby var. radiolata Barneby

    (Plate XXIV)

    Characters as given in key. — Collections: 17 (i).

    Brushy hillsides and banks of streams, 1050-1450 m (± 3500-4800 ft), locally plentiful but of restricted range in canyons leading to Rio Ameca and Rio Grande de Santiago in n.-centr. Jalisco and adjoining Nayarit and Zacatecas, s. in Jalisco to the basins of Lago Magdalena and Lago Atotonilco, w. to the headwaters of Rio Guachinango. — Flowering late August to March. — Representative: Zacatecas. Moyahua de Estrado: 10-12 mi. s. of Moyahua, Gentry 18,299 (RENNER, US). Nayarit. Ixtlan del Rio: La Atarjea, Mexia 878 (F, MICH, NY, UC); e. of Ixtlan, Ripley & Barneby 14,052 (CAS, NY, US). Jalisco. Guadalajara; Guadalajara, Pringle 1731 (F, L, M, UC); La Barranca, Jones in 1930 (NY, UC). Villa Corona: road to Cocula, Rzedowski 14,526 (ENCB). Magdalena: w. of La Quemada, Pennell 19,919 (GH, NY). Etzatlan: Etzatlan, Rose & Painter 7350 (NY, US), Gentry 5348 (ARIZ). Mezquitic (?): road from San Juan Capistrano (Zac.), Rose 2318 (NY). Guachinango: Zluachinango, E. W. Nelson 4007 (NY); Mascota: C. de la Barranca, Gonzalez & Palafox 69 (MICH).

    Marina diffusa (Moric.) Barneby var. radiolata (rayed, of the banner) Barneby, var. nov., a var. diffusa panicula minus intricatim ramosa, foliis ultimis majoribus, foliolis praesertim 2-3-jugis, racemis inferioribus 9-25-floris terminalibus saltern 5-floris, vexillique lamina radiatim livido-striata eglandulosa separanda. — Nayarit. Ixtlan del Rio: La Barranca [= Plan de Barranca], feb 21, 1927, M. E. Jones. — Holotypus, NY.

    While the panicle of var. radiolata is less elaborately ramified than that of var. diffusa the guise of the growing plant is hardly different, except for the deep maroon-purple of the petals, which appear almost black in strong sunlight. The range of var. radiolata forms an enclave within the extensive area occupied by its species, an enclave from which the type is nearly absent. Typical var. diffusa occurs abundantly along the hills around the north-west shore of Lago Chapala and has been collected in the canyon of one affluent of the Rio Grande northeast of Guadalajara (Ixtlahuacan de los Membrillos, Detling 8785, MICH), but these populations show no sign of intergradation to var. radiolata.