Ya Yang

  Name:      Euphorbia polycarpa var. polycarpa  

Accepted Name:None
Common Names:
Smallseed sandmat
TOLKIN GUID:fb66c172-1307-439e-a6a7-c525720333a1
TOLKIN GUID URL:http://app.tolkin.org/guids/fb66c172-1307-439e-a6a7-c525720333a1
Type Details:
Species: None
Type Collection:
(See Euphorbia polycarpa Benth. for type information)
Type Date: None
Type Locality: None
Type Herbaria: None
Neo Type: None
Synonyms: show/hide
Euphorbia intermixta S. Watson, Proc. Amer. Acad. Arts 24: 74. 1889.
Chamaesyce intermixta (S. Watson) Millsp., Publ. Field Mus. Nat. Hist., Bot. Ser. 2: 409. 1916.
Chamaesyce tonsita Millsp., Publ. Field Mus. Nat. Hist., Bot. Ser. 2: 412. 1916.
Ingroup Clade:
Adapted from Flora of North America, treatment by V.W. Steinmann (description and habitat information based on U.S.A. collections only):

Herbs, annual or perennial, from a slender taproot to a thickened rootstock. Stems prostrate to ascending (usually mound- or mat-forming), glabrous, puberulent, shortly pilose or hirsute, 7-25 cm. Leaves opposite; stipules distinct (or occasionally connate on one side of the stem), subulate, 0.3-0.6 mm, shortly pilose or hirsute; petiole 0.4-0.9 mm, glabrous, puberulent, shortly pilose or hirsute; blade ovate, elliptic, or oblong, 1.5-5 x 1-3 mm, base asymmetrical, rounded to slightly oblique, apex obtuse or acute, margin entire, venation obscure, only the midvein sometimes conspicuous, glabrous, puberulent, shortly pilose, or hirsute. Cyathia solitary in the distal nodes of the stems, these sometimes congested, very short and giving the appearance of the cyathia being clustered; peduncles absent or to 1.6 mm. Involucre campanulate, 0.6-1.1 x 0.5-1.3 mm; glands 4, oblong, 0.15-0.3 x 0.25-0.5 mm, dark pink to black purple; appendages present, ovate or flabellate, sometimes reduced to a thin rim around the outer margin of the gland, entire to shallowly lobed, 0.1-0.2 x 0.3-0.8 mm, white to pink. Staminate flowers 15-30. Pistillate flower: ovary glabrous, puberulent, or shortly pilose, styles 0.2-0.4 mm, 2-fid to 1/2 their length. Capsule ovoid to subglobose, 1.1-1.4 x 1.1-1.4 mm, glabrous, puberulent or shortly pilose; columella 0.9-1.2 mm. Seeds narrowly oblong-ovoid, quadrangular to nearly triangular in cross-section, 0.8-1.1 x 0.5-0.6 mm, pink-brown to light brown, smooth or faintly rippled.
Desert scrub, common in both pristine habitats and disturbed areas, especially along roadsides where it is often dominant; minus 20-1200 m. Flowering and fruiting year-round in response to sufficient moisture.
Phylogenetic Relationships:
See Yang and Berry, 2011
Comments: None
Chromosome Number: None
Uses: None
Toxicity: None
Conservation Status: None
General Distribution:
SC & SW U.S.A. (Arizona, California, Nevada, Utah, Texas), N Mexico
Collection number
Institution code
No results found.
DNA Sample(s): 8612
DNA Sample(s) Sequences

Berry, P.E., Peirson, J., Steinmann, V.W., Morawetz, J.J., Riina, R., Yang, Y., Geltman, D.V., and Cacho, N.I. (in review). "Euphorbia." In: Flora of North America north of Mexico 12, Flora of North America Editorial Committee. New York and Oxford.

Yang, Y., and Berry, P.E. (2011). Phylogenetics of the Chamaesyce Clade (Euphorbia, Euphorbiaceae): Reticulate evolution and long-distance dispersal in a prominent C4 lineage. American Journal of Botany 98(9), 1486-1503.

Yang, Y., Riina, R., Morawetz, J.J., Steinmann, V.W., Haevermans, T., Aubriot, X., and Berry, P.E. (2012). Molecular phylogenetics and classification of Euphorbia subgenus Chamaesyce (Euphorbiaceae). Taxon 61(4), 764-789.

This project's data is shared under the CC-BY license.