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Cortaderia selloana
PAMPAS GRASS

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: CortaderiaView DescriptionDichotomous Key

Habit: Perennial herb; dioecious. Stem: densely clumped, erect. Leaf: generally basal with conspicuous midrib; sheath glabrous to hairy, fracturing into short segments with age; blade flat and folded, margin sharp and cutting. Inflorescence: panicle-like, plume-like. Spikelet: +- laterally compressed; glumes unequal, 1-veined; florets 2--8, breaking above glumes and between florets; lemma silky-hairy, 3-veined, tip drawn out, awn-like.
Species In Genus: 25 species: South America, New Zealand, New Guinea. Etymology: (Spanish, to cut or harvest)
eFlora Treatment Author: H.E. Connor

Cortaderia selloana (Schult. & Schult. f.) Asch. & Graebn.
NATURALIZED
Habit: Plants staminate or pistillate, reproducing sexually. Stem: 2--4 m. Leaf: blade 3--12 mm wide, blue-green adaxially, with small tuft of short hairs at base, dark green abaxially. Inflorescence: 3--13 dm, variously colored. Spikelet: 15--17 mm; florets 4--8; pistillate lemma hairy, staminate lemma glabrous except at base. Chromosomes: 2n=72.
Ecology: Disturbed sites; Elevation: < 300 m. Bioregional Distribution: NCo, n SNF (American River), n ScV, CW (exc SCoRI), SCo, ChI, WTR, cultivated elsewhere; Distribution Outside California: southern United States; native to eastern South America. Flowering Time: Sep--Mar
eFlora Treatment Author: H.E. Connor
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Citation for this treatment: H.E. Connor 2016. Cortaderia selloana, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=20429, accessed on April 29, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on April 29, 2016.


Cortaderia selloana
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© 2008 Neal Kramer

More photos of Cortaderia selloana in CalPhotos


Geographic subdivisions for Cortaderia selloana:
NCo, n SNF (American River), n ScV, CW (exc SCoRI), SCo, ChI, WTR, cultivated elsewhere;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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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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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.