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Aristida purpurea var. purpurea
PURPLE THREE-AWN


Higher Taxonomy
Family: Poaceae (Gramineae)View DescriptionDichotomous Key
Common Name: GRASS FAMILY
Habit: Annual to woody perennial herb; roots generally fibrous. Stem: generally round, hollow; nodes swollen, solid. Leaf: alternate, 2-ranked, generally linear, parallel-veined; sheath generally open; ligule membranous or hairy, at blade base. Inflorescence: various (of generally many spikelets). Spikelet: glumes generally 2; florets (lemma, palea, flower) 1--many; lemma generally membranous, sometimes glume-like; palea generally +- transparent, +- enclosed by lemma. Flower: generally bisexual, minute; perianth vestigial; stamens generally 3; stigmas generally 2, generally plumose. Fruit: grain, sometimes achene- or utricle-like.
Genera In Family: 650--900 genera; +- 10550 species: worldwide; greatest economic importance of any family (wheat, rice, maize, millet, sorghum, sugar cane, forage crops, ornamental, weeds; thatching, weaving, building materials). Note: Generally wind-pollinated. Achnatherum, Ampelodesmos, Hesperostipa, Nassella, Piptatherum, Piptochaetium, Ptilagrostis moved to Stipa; Elytrigia, Leymus, Pascopyrum, Pseudoroegneria, Taeniatherum to Elymus; Hierochloe to Anthoxanthum; Lolium, Vulpia to Festuca; Lycurus to Muhlenbergia; Monanthochloe to Distichlis; Pleuraphis to Hilaria; Rhynchelytrum to Melinis. The following taxa (in genera not included here), recorded in California from historical collections or reported in literature, are extirpated, lacking vouchers, or not considered naturalized: Acrachne racemosa (Roth) Ohwi, Allolepis texana (Vasey) Soderstr. & H.F. Decker, Amphibromus nervosus (Hook. f.) Baill., Axonopus affinis Chase, Axonopus fissifolius (Raddi) Kuhlm., Coix lacryma-jobi L., Cutandia memphitica (Spreng.) K. Richt., Dinebra retroflexa (Vahl) Panz., Eremochloa ciliaris (L.) Merr., Eustachys distichophylla (Lag.) Nees, Gaudinia fragilis (L.) P. Beauv., Miscanthus sinensis Andersson, Neyraudia arundinacea (L.) Henrard, Phyllostachys aurea Rivière & C. Rivière, Phyllostachys bambusoides Siebold & Zuccarini, Rottboellia cochinchinensis (Lour.) Clayton, Schedonnardus paniculatus (Nutt.) Branner & Coville, Schizachyrium cirratum (Hack.) Wooton & Standl., Schizachyrium scoparium (Michx.) Nash, Themeda quadrivalvis (L.) Kuntze, Thysanolaena latifolia (Hornem.) Honda, Tribolium obliterum (Hemsl.) Renvoize, Zea mays L., Zizania palustris L. var. interior (Fassett) Dore, Zoysia japonica Steud. Paspalum pubiflorum E. Fourn., Paspalum quadrifarium Lam., are now reported for southern California (J Bot Res Inst Texas 4:761--770). See Glossary p. 30 for illustrations of general family characteristics.
eFlora Treatment Author: James P. Smith, Jr., except as noted
Scientific Editor: James P. Smith, Jr., J. Travis Columbus, Dieter H. Wilken.
Genus: AristidaView DescriptionDichotomous Key

Common Name: THREE-AWN
Habit: Annual, perennial herb, cespitose. Stem: ascending to erect, generally glabrous (except Aristida californica). Leaf: basal and cauline; basal often tufted; ligule hairy; blade flat or inrolled. Inflorescence: raceme-like or panicle-like; branches spike-like. Spikelet: glumes narrowly lanceolate, thin, 1-veined, awn generally 0; floret 1, breaking above glumes; lemma +- fusiform, hard when mature, 3-veined, tip beak-like or not, awned at tip, awns 3, equal or unequal; palea < lemma, enclosed by lemma, transparent. Fruit: narrowly fusiform.
Species In Genus: +- 300 species: worldwide, arid warm temperate. Etymology: (Latin: awn) Note: Some species noxious weeds.
eFlora Treatment Author: Rosa Cerros-Tlatilpa & Kelly W. Allred
Reference: Allred 2007 FNANM 25:315--342
Unabridged Reference: Allred 1992 Great Basin Naturalist 52:41--52
Species: Aristida purpureaView Description 


Habit: Perennial herb. Stem: generally erect, unbranched, 1--10 dm. Leaf: blade 5--25 cm, 1--2 mm wide, generally inrolled. Inflorescence: 1° inflorescence branches spreading to appressed, tips sometimes spreading or ascending. Spikelet: glumes thin, lower 4--12 mm, upper 7--25 mm; awns equal or central slightly longer. Chromosomes: 2n=22,44,66,88.

Aristida purpurea Nutt. var. purpurea
NATIVE
Leaf: generally cauline; blade 3--17 cm. Inflorescence: 5--25 cm, +- purple; 1° inflorescence branches and spikelet stalks thread-like, curving to drooping, appearing S- or U-shaped. Spikelet: lower glume 4--9 mm, upper 7--16 mm; lemma 6--12 mm, awns generally 20--60 mm, 0.1--0.3 mm wide at base. Chromosomes: 2n=22,44,66.
Ecology: Dry slopes, shrubland; Elevation: < 1500 m. Bioregional Distribution: SCo, SnBr, PR, DMtns; Distribution Outside California: to Arkansas, northern Mexico. Flowering Time: Feb--Nov
Jepson eFlora Author: Rosa Cerros-Tlatilpa & Kelly W. Allred
Reference: Allred 2007 FNANM 25:315--342
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Citation for this treatment: Rosa Cerros-Tlatilpa & Kelly W. Allred 2012, Aristida purpurea var. purpurea, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=54453, accessed on October 16, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on October 16, 2019.

Aristida purpurea var. purpurea
click for enlargement
© 2013 Steve Matson
Aristida purpurea var. purpurea
click for enlargement
© 2013 Steve Matson
Aristida purpurea var. purpurea
click for enlargement
© 2013 Steve Matson
Aristida purpurea var. purpurea
click for enlargement
© 2013 Steve Matson
Aristida purpurea var. purpurea
click for enlargement
© 2013 Steve Matson

More photos of Aristida purpurea var. purpurea in CalPhotos



Geographic subdivisions for Aristida purpurea var. purpurea:
SCo, SnBr, PR, DMtns
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).





 

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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.