Plant Image
Plant - fall
Iron King Tr


Yavapai County Native & Naturalized Plants

Digitaria californica - Arizona cottontop

Synonyms: Trichachne californica
Other Common Names: California cottontop
Plant Form: Grass

Family: Poaceae


   
 
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Seedhead
Iron King Tr
Sue Smith
Spikelets
Iron King Tr
Sue Smith
Ligule and hairs
Iron King Tr
Sue Smith
  Grass Description -   Glossary of Grass Terminology


Origin: Native    Season: Warm
Habitat Description: Rocky ridges, margins of fields, plains and open ground.
Plant Communities:Desert Scrub, Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland, Disturbed Areas
Elevation: 1000 - 6000 feet


General Description

Desc: Tall, 1 to 4 feet, with rather hard round stems sometimes bent abruptly, like a knee. Seedhead looks cottony when mature, before seeds fall.
Identification Notes: Tufted perennial stems 16 to 39 inches tall erect from a swollen, knotty base; basal sheaths long soft hairs; collar hairy; contracted, branched seedhead; second glume narrow and densely hairy with soft white silky hairs tinged with purple.
Grass Type: Perennial bunchgrass  Rhizomes: N  Stolons: N
Large Dense Clump (> 2 feet): N  Bushy (highly branched): N
Height with Seedheads: 24 to 36 inches
Seedhead Structure: Branched - contracted  Seedhead Droops: N
Flowering Period: Jul - Nov
Flower Characteristics

Number of Flowers per Spikelet: Multi-flowered  Spikelets One-sided: N
Awns: Absent   Three Awns: N  Awns Bent: N
Flower and Seedhead Notes: Dense slender seedheads 2 to 6 inches long with spikelets which have silky, long, whitish or purplish tinged hairs.
Vegetative Charcteristics

Blade Hairy: Y    Blade with White Margins: Y    Blade Cross section: Flat or folded
Blade Notes: Blades 3/4 to 4-3/4 inches long, 1/16 to 1/2 inch wide, do not clasp the stem firmly but pull away, exposing a smooth purple to green internode.
Sheath Hairy: Y    Tuft of Hairs at top of Sheath or Collar: Y    Ligules: Membranous
Auricles (Ear-like lobes at collar area: N

Forage Value: Good.


  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 8.0  
http://cales.arizona.edu/yavapaiplants/SpeciesDetailGrass.php  
Last Updated: Dec 13, 2022
Content Questions/Comments: Email Matt Halldorson  
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