Difference between revisions of "Agoseris grandiflora"

From Puget Prairie Plants
Line 1: Line 1:
''Agoseris grandiflora'' or bigflower agoseris is a floweing plant in the Asteracae family.   
'''''Agoseris grandiflora'''''', commonly known as bigflower agoseris or grassland agoseris, is a floweing plant in the Asteracae family.   
<br>Synonyms: ''Agoseris laciniata''
<br>Synonyms: ''Agoseris laciniata''

Revision as of 09:54, 22 April 2012

Agoseris grandiflora', commonly known as bigflower agoseris or grassland agoseris, is a floweing plant in the Asteracae family.
Synonyms: Agoseris laciniata


  • Kingdom Plantae – Plants
  • Subkingdom Tracheobionta – Vascular plants
  • Superdivision Spermatophyta – Seed plants
  • Division Magnoliophyta – Flowering plants
  • Class Magnoliopsida – Dicotyledons
  • Subclass Asteridae
  • Order Asterales
  • Family Asteraceae – Aster family
  • Genus Agoseris Raf. – agoseris
  • Species Agoseris grandiflora (Nutt.) Greene – bigflower agoseris


Scapose, stout perennial, 2-7 dm. tall, somewhat hairy when young, the juice milky, with basal, oblanceolate to broadly linear pinnatifid leaves (10-25 cm. long and 1-3 cm. wide. Large flower head with many yellow flowers, involucre 1.5-4 cm. high, its outer bracts broad and short, the inner narrower and elongate; corollas all ligulate. Produces fruits with achene body 4-7 mm. long, tapering to a slender beak 2-4 times as long. http://biology.burke.washington.edu/herbarium/imagecollection.php

Bloom Period

May-August http://biology.burke.washington.edu/herbarium/imagecollection.php


West of the Rocky Mountains http://plants.usda.gov/java/profile?symbol=AGGR


Meadows and other open places in the lowlands and at moderate elevations in the mountains, often in dry areas. http://biology.burke.washington.edu/herbarium/imagecollection.php



Photo Gallery



Agoseris grandiflora

Abbreviation: AGGR

Seed sample from: 2010

Average Measurement: 5.2 x 0.7 x 0.7

Measurement Range: L: 4.6 - 6, W: 0.5 - 0.9, D: 0.5 - 0.9


Shape: Seeds tapering to a beak 2-3 times as long as the body of the seed.

Color: Seeds pale brown with white, glossy hilum.

Additional Structures: Pappus white, and downy.

Surface: Seed body deeply longitudinally grooved. Ridges are finely toothed. Seed slightly glossy.

Latitudinal Cross Section: elliptical Latitudinal AGGR.png

Longitudinal Cross Section: obovate Longitudinal AGGR.png

Basic Explanations and Assumptions:

The dimensions for the seeds are length x width x depth. The location of the hilum is used as the base of the seed, and the length is measured from hilum to the opposite apex. Where a style is present, the length is measured from the hilum to the bottom of the style. Width is measured at a right angle to the length at the widest part. Depth is measured at a right angle to the intersection of height and width lines.

Measurements included are the mean average for each measurement of ten separate seeds.

All measurements in millimeters unless otherwise noted.