Psorodendron Rydb., N. Amer. Fl.
Creators: name: Urrego, Paola Piñeros
name: Suárez-Barón, Harold
name: Pabón-Mora, Natalia
name: González, Favio
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Fabales
Fabaceae
Psorodendron

description: Psorodendron Rydb., N. Amer. Fl. 24(1): 41 (1919).
Type: Dalea johnsonii S. Wats.
Stoloniferous herbs, shrubs or trees to 7(-10) m tall. Branches often spinescent; stems glabrous or sparsely strigulose or vestured with ascending, appressed indument. Leaves pinnate or simple, caducous or persistent at anthesis. Inflorescences loosely racemose or spicate, the axis becoming spiniform during or after blooming. Flowers subtended by a deciduous bract and two small subulate bracteoles at the base of the short pedicels. Petals glabrous, with or without glands. Apex of the connective with or without a gland. Ovules 2-7 per ovary. Pods to 1 cm long, inserted to exserted.
Psorodendron, as reinstated here, comprises five species widespread in desert basins of Arizona, Baja California, California, Nevada, and Utah (United States). Full synonymy of all five species (based on Barneby, 1977) is given below; names marked with asterisk correspond to Psorodendron binomials treated under the synonymy of Psorothamnus spp. by Barneby (1977).
Psorodendron arborescens (Torr.) Rydb. = Dalea amoena S. Watson = Dalea arborescens Torr. ex A.Gray = Dalea californica (S.Watson) Vail = Dalea fremontii var. minutifolia (Parish) L.Benson = Dalea fremontii var. pubescens (Parish) L.Benson = Dalea fremontii var. saundersii (Parish) Munz = Dalea fremontii var. simplifolia (Parish) L.Benson = Dalea saundersii Parish = Parosela amoena (S. Watson) Vail = Parosela arborescens (Torr.) A.Hell. = Parosela californica (S.Watson) Vail = Parosela fremontii var. wheleri (Vail) B.L. Robins. ex MacBr. = Parosela fremontii var. saundersii (Parish) MacBride = Parosela johnsoni var. minutifolia Parish = Parosela johnsoni var. saundersii (Parish) Parish = Parosela neglecta Parish = Parosela saundersii (Parish) Abrams = Parosela wheeleri Vail = Psorodendron amoenum (S.Watson) Rydb. *; Psorodendron californicum (S.Watson) Rydb. * = Psorodendron pubescens (Parish) Rydb. * = Psorodendron saundersii (Parish) Rydb. * = Psorodendron wheeleri (Vail) Rydb. * = Psorothamnus arborescens (A.Gray) Barneby = Psorothamnus arborescens (A.Gray) Barneby var. minutifolius (Parish) Barneby = Psorothamnus arborescens (A.Gray) Barneby var. pubescens (Parish) Barneby.
Psorodendron fremontii (Torr.) Rydb. = Dalea fremontii Torr. ex A.Gray = Dalea johnsonii S.Watson = Parosela fremontii (Torr.) Vail = Parosela johnsonii (S.Watson) Vail = Psorodendron johnsonii (S.Watson) Rydb. = Psorothamnus fremontii (Torr.) Barneby.
Psorodendron kingii (S. Watson) Rydb. = Dalea kingii S.Wats. = Parosella kingii A. Heller = Psorothamnus kingii (S.Watson) Barneby.
Psorodendron schottii (Torr.) Rydb. = Dalea schottii Torr. = Parosela schottii (Torr.) A.Hell. = Parosela schottii var. puberula Parish = Psorodendron puberulum (Parish) Rydb. * = Psorothamnus schottii (Torr.) Barneby.
Psorodendron spinosum (A.Gray) Rydb. = Dalea spinosa A.Gray = Asagraea spinosa (A.Gray) Baillon = Parosella spinosa (A.Gray) A. Hell. = Psorothamnus spinosus (A.Gray) Barneby.
4. Dalea is paraphyletic with respect to Marina, as D. filiciformis results sister to Marina. This result was obtained in all the partitioned and the combined analyses, including that based on the ITS- trnK/matK dataset with a significantly increased sampling within the species-rich Dalea. The bootstrap values that support this particular result ranged from 95 % in the ITS-based analysis (Suppl. Fig. 1) to 100 % in the combined ITS + matK/trnK analysis (Fig. 2). Barneby (1977: 149) already stated that D. filiciformis “has no really close relative in Dalea and its affinities are difficult to estimate,” and pointed out its pod morphology resembles that found in Marina species. Thus, the following formal transfer is required:
description: Published as part of Urrego, Paola Piñeros, Suárez-Barón, Harold, Pabón-Mora, Natalia & González, Favio, 2023, Reinstatement of the genus Psorodendron and related systematic novelties as revealed from phylogenetic analyses of the tribe Amorpheae (Leguminosae, Papilionoideae), pp. 49-65 in Caldasia 45 (1) on pages 57-58, DOI: 10.15446/caldasia.v45n1.96498, http://zenodo.org/record/15265087