Antennaria howellii

From Puget Prairie Plants
Revision as of 20:21, 27 February 2012 by Smiwhi09 (Talk | contribs)


Antennaria howellii

Abbreviation: ANHO

Seed sample from: 2009

Average Measurement: 1.1 x 0.3 x 0.2


Shape: Slightly larger than Anaphalis margaritacea and has lighter, glossier, and more dimpled hilum.

Color: Brown.

Additional Structures: At opposite end of hilum is pappus of white hairs that attach in a ring around the end of the seed. Pappus is significantly longer that seed.

Surface: Seed is slightly grooved, hairy, and covered with white globules.

Could be confused with: Anaphalis margaritacea

Latitudinal Cross Section: elliptical Anthowelliilat.png

Longitudinal Cross Section: elliptical ARHI-long-crosssection.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.