Gallery

Family

Genus

Common name

Noxious Weed Seed

AOSA Examination List

Species Category

Disseminule/Planting Unit

Shape

Seed length

Seed width

Seed thickness

Color

Texture

Other structures

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Heliotropium arborescens. Brown nutlets with a white attachment area.

Heliotropium arborescens
Heliotropium arborescens. Brown nutlets with a white attachment area.

Heracleum mantegazzianum. Mericarps with brown longitudinal lines that are bulbous at their distal ends. Photo by Julia Scher, USDA-APHIS-PPQ.

Heracleum mantegazzianum
Heracleum mantegazzianum. Mericarps with brown longitudinal lines that are bulbous at their distal ends. Photo by Julia Scher, USDA-APHIS-PPQ.

Heracleum mantegazzianum. Mericarps with a scar on the apical end and a winged margin. Photo by Julia Scher, USDA-APHIS-PPQ.

Heracleum mantegazzianum
Heracleum mantegazzianum. Mericarps with a scar on the apical end and a winged margin. Photo by Julia Scher, USDA-APHIS-PPQ.

Heracleum mantegazzianum. Mericarps with brown longitudinal lines that are bulbous at their distal ends. Photo by Julia Scher, USDA-APHIS-PPQ.

Heracleum mantegazzianum
Heracleum mantegazzianum. Mericarps with brown longitudinal lines that are bulbous at their distal ends. Photo by Julia Scher, USDA-APHIS-PPQ.

Heracleum maximum. Mericarps with longitudinal brown lines between the ribs, there are four on the ventral side and two on the dorsal side. Photo by Julia Scher, USDA-APHIS-PPQ.

Heracleum maximum
Heracleum maximum. Mericarps with longitudinal brown lines between the ribs, there are four on the ventral side and two on the dorsal side. Photo by Julia Scher, USDA-APHIS-PPQ.

Herrickia glauca. Achene with longitudinal ribs and a well-developed pappus crown.

Herrickia glauca
Herrickia glauca. Achene with longitudinal ribs and a well-developed pappus crown.

Hesperis matronalis. Seeds are scurfy and covered with uniformly spaced tubercules and irregular humps.

Hesperis matronalis
Hesperis matronalis. Seeds are scurfy and covered with uniformly spaced tubercules and irregular humps.

Hesperis matronalis. Seeds are scurfy and covered with uniformly spaced tubercules.

Hesperis matronalis
Hesperis matronalis. Seeds are scurfy and covered with uniformly spaced tubercules.

Hesperostipa comata. Small crown at the base of the awn.

Hesperostipa comata
Hesperostipa comata. Small crown at the base of the awn.

Hesperostipa spartea, Callus with long, backward pointing hairs; short hairs on the lemma.

Hesperostipa spartea
Hesperostipa spartea, Callus with long, backward pointing hairs; short hairs on the lemma.

Hesperostipa spartea. Long twisted awn terminating with a lateral arm.

Hesperostipa spartea
Hesperostipa spartea. Long twisted awn terminating with a lateral arm.

Heteranthera limosa. Seeds with strong, longitudinally spaced ribs. Photo by Julia Scher, USDA-APHIS-PPQ.

Heteranthera limosa
Heteranthera limosa. Seeds with strong, longitudinally spaced ribs. Photo by Julia Scher, USDA-APHIS-PPQ.

Heteranthera limosa. Seeds are finely reticulated between the large ribs. Photo by Julia Scher, USDA-APHIS-PPQ.

Heteranthera limosa
Heteranthera limosa. Seeds are finely reticulated between the large ribs. Photo by Julia Scher, USDA-APHIS-PPQ.

Heteranthera limosa. Raised black hilum. Photo by Julia Scher, USDA-APHIS-PPQ.

Heteranthera limosa
Heteranthera limosa. Raised black hilum. Photo by Julia Scher, USDA-APHIS-PPQ.

Heteromeles arbutifolia. Black and red colored achenes are enclosed in fruit tissue.

Heteromeles arbutifolia
Heteromeles arbutifolia. Black and red colored achenes are enclosed in fruit tissue.

Heterotheca villosa. Achenes are smooth with hairs between the ribs.

Heterotheca villosa
Heterotheca villosa. Achenes are smooth with hairs between the ribs.

Hibiscus laevis. Seeds that are scurfy with short spiny hairs.

Hibiscus laevis
Hibiscus laevis. Seeds that are scurfy with short spiny hairs.

Hibiscus sp. Seeds with a long oval hilum.

Hibiscus sp.
Hibiscus sp. Seeds with a long oval hilum.

From Left to Right: 1. Hibiscus trionum 2. Abutilon theophrasti. Seeds with a hilum that is in a deep notch covered with a flat caruncle.

Hibiscus trionum
From Left to Right: 1. Hibiscus trionum 2. Abutilon theophrasti. Seeds with a hilum that is in a deep notch covered with a flat caruncle.

Hibiscus trionum. Seeds are dark brown with light brown or yellow tubercules.

Hibiscus trionum
Hibiscus trionum. Seeds are dark brown with light brown or yellow tubercules.

Hibiscus trionum. Edge view of seed showing hilar region. Photo by Rodney Young, USDA-APHIS-PPQ.

Hibiscus trionum
Hibiscus trionum. Edge view of seed showing hilar region. Photo by Rodney Young, USDA-APHIS-PPQ.

Hieracium aurantiacum. Achenes are black with five to six strong, rough longitudinal ribs with broad interspaces.

Hieracium aurantiacum
Hieracium aurantiacum. Achenes are black with five to six strong, rough longitudinal ribs with broad interspaces.

Hirschfeldia incana. Reddish-brown seeds with a surface groove that terminates at the hilum.

Hirschfeldia incana
Hirschfeldia incana. Reddish-brown seeds with a surface groove that terminates at the hilum.

Hirschfeldia incana. Close-up of reticulum showing pitted interspaces. Photo courtesy of USDA-APHIS-PPQ.

Hirschfeldia incana
Hirschfeldia incana. Close-up of reticulum showing pitted interspaces. Photo courtesy of USDA-APHIS-PPQ.

Hoffmannseggia glauca. Seeds are smooth to sandy-coated. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Hoffmannseggia glauca
Hoffmannseggia glauca. Seeds are smooth to sandy-coated. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.

Holcus lanatus. Spikelets with glumes that are papery and glandular with hairs on the keel nerves.

Holcus lanatus
Holcus lanatus. Spikelets with glumes that are papery and glandular with hairs on the keel nerves.

Holcus lanatus. Spikelets and florets.

Holcus lanatus
Holcus lanatus. Spikelets and florets.

Holcus lanatus. Spikelets with a narrow first glume and a second glume that is wide with strong nerves on the sides.

Holcus lanatus
Holcus lanatus. Spikelets with a narrow first glume and a second glume that is wide with strong nerves on the sides.

Hordeum brachyantherum subsp. brachyantherum. Spikelets with a long rachilla and lateral spikelets that are usually sterile.

Hordeum brachyantherum subsp. brachyantherum
Hordeum brachyantherum subsp. brachyantherum. Spikelets with a long rachilla and lateral spikelets that are usually sterile.

Hordeum brachyantherum subsp. californicum. Spikelets with central fertile florets that are large, but lateral sterile florets are small.

Hordeum brachyantherum subsp. californicum
Hordeum brachyantherum subsp. californicum. Spikelets with central fertile florets that are large, but lateral sterile florets are small.

Hordeum jubatum. Fascicles with two lateral spikelets that are pedicellate with linear glumes and a rudimentary floret.

Hordeum jubatum
Hordeum jubatum. Fascicles with two lateral spikelets that are pedicellate with linear glumes and a rudimentary floret.

Hordeum murinum ssp. glaucum. Spikelets with pubescent glumes.

Hordeum murinum subsp. glaucum
Hordeum murinum ssp. glaucum. Spikelets with pubescent glumes.

Hordeum pusillum. Fascicles with two pedicellate, sterile spikelets on either side of a fertile one.

Hordeum pusillum
Hordeum pusillum. Fascicles with two pedicellate, sterile spikelets on either side of a fertile one.

Hordeum pusillum. Fascicles with two lateral spikelets that are pedicellate and sterile, with glumes wide in the middle, and a rudimentary floret.

Hordeum pusillum
Hordeum pusillum. Fascicles with two lateral spikelets that are pedicellate and sterile, with glumes wide in the middle, and a rudimentary floret.

Hordeum vulgare. Florets that are glabrous and wrinkled where they are attached to the caryopsis.

Hordeum vulgare
Hordeum vulgare. Florets that are glabrous and wrinkled where they are attached to the caryopsis.

Hydrilla verticillata. Branches. Photo by Julia Scher, USDA-APHIS-PPQ.

Hydrilla verticillata
Hydrilla verticillata. Branches. Photo by Julia Scher, USDA-APHIS-PPQ.

Hydrilla verticillata. Stems and leaves. Photo by Julia Scher, USDA-APHIS-PPQ.

Hydrilla verticillata
Hydrilla verticillata. Stems and leaves. Photo by Julia Scher, USDA-APHIS-PPQ.