Hibiscus trionum

Species category

Weed

Common name

flower of an hour

Diagnostic characters

Planting unit

True seedTrue seed:
A mature fertilized ovule consisting of an embryo, with or without and external food reserve (e.g., endosperm) enclosed by the testa.

Shape

OvateOvate:
Egg-shaped with basal end the broadest.
with a divergent radicleRadicle:
The rudimentary root of the embryo, developing into the primary root after emergence from the seed coat.

Size

  • Length 1.9–2.2 mm
  • Width 2–2.3 mm
  • Thickness 0.9–1.2 mm

Color

Dark brown with light brown or yellow tubercules

Texture

Scattering of yellow tubercules

Other structures

HilumHilum:
The scar on the seed coat at the place of its detachment from the seed stalk (funiculus).
is in a deep notch covered with a flat caruncleCaruncle:
An appendage or outgrowth of the outer integument of the seed, e.g. leafy spurge.

Identification notes

Seed compressed with a deep notch containing the hilumHilum:
The scar on the seed coat at the place of its detachment from the seed stalk (funiculus).
, which is covered with a flat caruncleCaruncle:
An appendage or outgrowth of the outer integument of the seed, e.g. leafy spurge.
. Surface rough with scattered tubercules.

Noxious weed seed categories

State Noxious Weed: Colorado, Wyoming

AOSA examination list

Not included

More information

For more information, see ISMA fact sheet.

Nomenclature

Family

Malvaceae

Valid name

Hibiscus trionum L.

Synonyms

Trionum trionum (L.) Wooton & Standl., nom. inval.

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