N = Native and E = Exotic. Shade or sun aspect noted,
and town for location of plants.
Weights are ounces per square foot and pounds per acre. The dried
plant parts from one square foot were weighed, during the second
year of an exceptional drought, in 2008 in Central California
N - Cal. poppy, sun, Palo Alto, one plant = 0.0 oz.
or zero lbs.
N - Gumplant sun Palo Alto, one plant = 0.0 oz. or zero
lbs.
N - Tarweed, white, sun Palo Alto, one plant = 0.0 oz.
or zero lbs.
N - Turkey mullein, sun, Stanford, one plant = 0.0 oz.
or zero lbs.
N - Koleria grass, sun, Palo Alto, 10 plants = 0.01
oz. or 28 lbs.
N - Owls Clover, sun, Palo Alto, 20 plants = 0.01 oz. or
28 lbs.
N - Western Fescue, sun, Palo Alto, one plant = 0.05 oz.
or 134 pounds
N - Soap plant, sun Palo Alto, one plant = 0.05 oz. or
134 pounds
N - Lily family, Stanford, shade of oaks = <0.1 oz
or less than 270 lbs
N - Coyote mint, sun, Palo Alto, one plant = 0.1 oz. or
270 lbs.
N - Danthonia grass, sun, Woodside, 2 pl. = 0.1 oz. or
270 lbs.
N - Purple Needlegrass sun Woodside, 3 pl. = 0.1 oz. or
270 lbs.
N - Sitanion grass, sun, Palo Alto, one plant = 0.1 oz.
or 270 lbs.
--- Newspaper equivalent, a single sheet = 0.125 oz. or 335 lbs.
N - Elymus glaucus, shade, mtn. ecotype, Palo Alto,
6 plants = 0.2 oz. or 537 lbs.
N - Elymus glaucus, shade valley ecotype, Stanford, 2 plants
= 0.4 oz. or 1,075 lbs.
--- Gasoline equivalent = 1 oz. per square foot or 465
gallons or 2,700 lbs.
E - Wild oats 2 feet tall sun Palo Alto, 72 stems = 1.2
oz. or 3,225 lbs.
E - Harding grass 3 feet tall, sun Palo Alto, 32 stems
= 2.4 oz. or 6,450 lbs.