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Heterotheca
Heterotheca (common names goldenasters, camphorweed, and telegraph weed) is a genus of North American plants in the family Asteraceae.
Heterotheca (heterothe'ca:) comes from Ancient Greek ἕτερος héteros "other, different" and θήκη thḗkē "case, chest" (botanically, "ovary") and refers to the difference in shape, in some species in the genus, between the cypselae (achenes containing seed) of the disk and ray florets.
These are annual and perennial herbs bearing daisy-like flower heads with yellow disc florets and usually yellow ray florets, associated with mesic to xeric habitats across North America. Several species now included in Heterotheca were previously classified in the genus Chrysopsis.
Heterotheca species are used as food plants by the caterpillars of some species of Lepidoptera including Schinia lynx, Schinia nubila and Schinia saturata (all of which have been recorded on Heterotheca subaxillaris).
The leaf volatiles from which the name "camphorweed" is derived include camphor, but as a minor constituent (less than 2%); of the 41 documented volatiles in Heterotheca subaxillaris, for example, caryophyllene, pinene, borneol, myrcene, and limonene each comprise over 5% of the total.
The following species are recognized in the genus Heterotheca:
Many species have been included in Heterotheca at various times in the past, but are now regarded as sharing ancestry with other genera. The most common of these genera is Chrysopsis, but others include Aster, Bradburia, Osbertia, Munnozia, Pityopsis and Tomentaurum.
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Heterotheca
Heterotheca (common names goldenasters, camphorweed, and telegraph weed) is a genus of North American plants in the family Asteraceae.
Heterotheca (heterothe'ca:) comes from Ancient Greek ἕτερος héteros "other, different" and θήκη thḗkē "case, chest" (botanically, "ovary") and refers to the difference in shape, in some species in the genus, between the cypselae (achenes containing seed) of the disk and ray florets.
These are annual and perennial herbs bearing daisy-like flower heads with yellow disc florets and usually yellow ray florets, associated with mesic to xeric habitats across North America. Several species now included in Heterotheca were previously classified in the genus Chrysopsis.
Heterotheca species are used as food plants by the caterpillars of some species of Lepidoptera including Schinia lynx, Schinia nubila and Schinia saturata (all of which have been recorded on Heterotheca subaxillaris).
The leaf volatiles from which the name "camphorweed" is derived include camphor, but as a minor constituent (less than 2%); of the 41 documented volatiles in Heterotheca subaxillaris, for example, caryophyllene, pinene, borneol, myrcene, and limonene each comprise over 5% of the total.
The following species are recognized in the genus Heterotheca:
Many species have been included in Heterotheca at various times in the past, but are now regarded as sharing ancestry with other genera. The most common of these genera is Chrysopsis, but others include Aster, Bradburia, Osbertia, Munnozia, Pityopsis and Tomentaurum.