1. Family: Fabaceae Lindl.
    1. Dalea L.

      1. This genus is accepted, and its native range is America.


    Legumes of the World. Edited by G. Lewis, B. Schrire, B. MacKinder & M. Lock. Royal Botanic Gardens, Kew. (2005)

    Xerophytic herbs or shrubs
    Temperate, continental temperate, mediterranean, subtropical and montane tropical forest, woodland, thorn-thicket, grassland, shrubland and desert, often in gullies and on rocky hillsides
    SW Canada, USA, C America, Caribbean and south to Argentina. Mostly Mexico (c. 115 spp., c. 75 endemic) and USA to Canada (c. 23 endemic spp.), and a centre of radiation in the Andean region from Colombia, Peru, Ecuador (and Galapagos Is.), Bolivia, to NW Argentina and coastal N Chile (c. 27 spp.); 1 sp. naturalised in the Philippines
    Barneby (1977) treats Dalea as comprising 5 subgenera, most of which are divided further into sections; Dalea is a well-supported monophyletic genus except for D. filiciformis B.L.Rob. & Greenm. which is sister to Marina (McMahon & Hufford, 2004)

    The Amorpheae were expanded by Bentham (1865) as subtribe ‘Psoralieae’ of his very broadly drawn Galegeae. The latter also contained the genera now placed in Indigofereae, Brongniartieae, Millettieae, and Robinieae, as well as in the present restricted (but still heterogeneous) Galegeae sens. lat. Both Gray’s and Bentham’s concepts of Psoralieae included genera here placed in Amorpheae, as well as a broadly circumscribed Psoralea. Borissova (Nov. 1964) proposed a tribe Amorpheae containing the single genus Amorpha. Almost simultaneously, Hutchinson (Dec. 1964) introduced a tribe Daleeae (as ‘Daleae’) including four genera: Dalea, Thornbera, Petalostemon, and Kuhnistera, the last three placed as synonyms of Dalea by Barneby (1977).

    Hutchinson attempted to use petal insertion as the character separating Daleeae and Psoraleeae, but Barneby (1977) showed that Hutchinson’s definition and interpretation of this character were unsatisfactory. Barneby (1977, 1981) added Apoplanesia, Eysenhardtia, Parryella, Amorpha, Errazurizia, Psorothamnus, and Marina, all formerly placed in Psoraleeae, to Hutchinson’s (1964) Daleeae to produce the concept of Amorpheae as accepted here.

    The main character distinguishing Amorpheae lies in the inflorescence position, which is terminal in Amorpheae and axillary in Psoraleeae. Additionally, the leaves of Amorpheae are basically pinnate (although sometimes trifoliolate or unifoliolate by reduction), while those of Psoraleeae are basically trifoliolate (although sometimes palmately >3-foliolate or even pinnate). The basic chromosome number appears to be 10 in Amorpheae (reduced in some species of Dalea) but 11 in Psoraleeae. Stirton (1981a) added further characters that reinforce the distinction: the form of the cotyledons, the positions of the embryo and radicle in the seed, seed shape, fruit structure, and the pollen. Ferguson & Skvarla (1981) also pointed out that the pollens of Psoraleeae and Amorpheae have very little in common. Barneby (1977) suggested that the papilionoid flower of the more derived species of Dalea may have evolved independently from that of other papilionoids, but this hypothesis is rejected by McMahon & Hufford (2004), based on studies of floral development in Dalea, Marina and Psorothamnus (McMahon & Hufford, 2002).

    Molecular work (Doyle, 1995) initially placed Amorpheae among the New World tropical tribes, as sister to a clade comprising Lotus and members of the IRLC clade. More recently (e.g., Doyle et al., 2000; Pennington et al., 2001; Kajita et al., 2001), Amorpheae emerges as one of a number of equally-ranked groups with the Dalbergioid and Genistoid clades. Lavin et al. (2001a) included sequences from four genera of Amorpheae (Apoplanesia, Eysenhardtia, Amorpha and Marina) as part of their study of the Dalbergioid clade. Three analyses, each based on a different gene, and one combined analysis using both molecular and morphological data, all agreed firstly in placing Amorpheae as sister to the whole Dalbergioid clade, and secondly in supporting the monophyly of Amorpheae. This is confirmed in subsequent analyses (e.g., Wojciechowski, 2003; Wojciechowski et al., 2004; McMahon & Hufford, 2004). All genera in the tribe were sequenced in the analysis of McMahon & Hufford (2004) and two well supported clades were recognised: the Amorphoid clade comprising Parryella, Amorpha, Apoplanesia, Errazurizia and Eysenhardtia; and the Daleoid clade with Psorothamnus, Marina and Dalea (Fig. 39). Psorothamnus is paraphyletic in the latter study with two monophyletic clades dividing neatly along taxonomic lines. One of these, the Psorodendron clade, is basally branching in the Daleoid clade and McMahon & Hufford (2004) state that this will be resurrected at generic level, thus recognising 9 genera in the tribe. For this account, however, Amorpheae is treated as comprising 8 genera and (245)–247–(248) species (Fig. 39).

    Used as soil stabilisers, green manure, stock forage, medicine, ornamentals, brooms and in making baskets; D. purpurea Vent. (purple prairie clover) roots are chewed for their pleasant taste and the dried leaves are a tea substitute



    Native to:

    Alabama, Alberta, Argentina Northeast, Argentina Northwest, Arizona, Arkansas, Bolivia, California, Chile North, Colombia, Colorado, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Florida, Galápagos, Georgia, Guatemala, Haiti, Honduras, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Kentucky, Leeward Is., Louisiana, Manitoba, Mexican Pacific Is., Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Netherlands Antilles, Nevada, New Mexico, Nicaragua, North Carolina, North Dakota, Oklahoma, Ontario, Oregon, Panamá, Peru, Puerto Rico, Saskatchewan, South Carolina, South Dakota, Tennessee, Tennessee, Texas, Utah, Venezuela, Washington, Wisconsin, Wyoming

    Introduced into:

    New York, Philippines

    Dalea L. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Rico, L. [1196], Bolivia K000295112
    Rico, L. [1543b], Bolivia K000295322
    Rico, L. [1580], Bolivia K000295192
    Rico, L. [1646], Bolivia K000295098
    Rico, L. [1658], Bolivia K000295479
    Rico, L. [2030], Mexico K000266008
    Rico, L. [2037], Mexico K000266012
    Rico, L. [2042], Mexico K000266017
    Rico, L. [2013], Mexico K000266374
    leg. ign. [s.n.], Australia K000217281

    First published in Opera Var.: 244 (1758)

    Accepted by

    • Govaerts, R. (2000). World Checklist of Seed Plants Database in ACCESS D: 1-30141.


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    Kew Names and Taxonomic Backbone
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