Hesperocnide

Hesperocnide
	Hesperocnide tenella
Systematics
	Nuclear eudicotyledons
	Rosids
	Eurosiden I
Order :	Rose-like (rosales)
Family :	Nettle family (Urticaceae)
Genre :	Hesperocnide
Scientific name
	Hesperocnide
	Torr.

Hesperocnide is a genus of plants in the nettle family(Urticaceae). It includes the two species Hesperocnide sandwicencis from the island of Hawaii and Hesperocnide tenella from California and Mexico .

description

Stem and leaf of Hesperocnide sandwicensis

Habit and inflorescences of Hesperocnide sandwicensis

Vegetative characteristics

Hesperocnide species are annual, herbaceous plants . They contain milk juice . The green parts of the plant have stinging hairs and non-stinging hairs. The upright, spreading or bent back stems have few or numerous stinging hairs. The opposite arranged leaves are divided into a petiole and a leaf blade. The simple leaf blade is more or less broadly ovate. The leaf blades of the uppermost leaves are sometimes elliptical. The leaf margins are roughly serrated or incised. The leaf blade is three to five-nerved. The cystolites are elongated. Stipules are present.

Generative characteristics

Hesperocnide species are single sexed ( monoecious ). The lateral more or less spherical, elongated racemose or panicle inflorescences contain many flowers. Bracts are not available. The unisexual flowers are in an inflorescence in purely male or purely female, loose to dense clusters. The four equally long bracts of the male flowers are free, they overlap and flattened in the bud. There are four stamens with kidney-shaped anthers. The rudimentary pistil of the male flowers is obovate to urn-shaped. The four bracts of the female flowers are tubular or urn-shaped fused, uniformly short-bristled hairy with an almost closed upper end and have two or four tiny teeth. The female flowers have no staminodes . The ovaries are straight. No stylus is recognizable. The durable scar is tufted.

The almost sessile achenes are ovate and laterally flattened. The durable flower shell envelops the achenes tightly like a bag and is covered with fine, hook-shaped hair.

The number of chromosomes is x = 12.

Occurrence

Hesperocnide sandwicencis occurs on the island of Hawaii in subalpine or alpine highlands at altitudes between 1780 and 2600 meters. Hesperocnide tenella thrives in California and Mexican northern Baja California on slopes, damp, shady locations in the chaparral , deserts, grasslands and "woodlands" or open areas at altitudes from 0 to 1000 meters.

Systematics

The genus Hesperocnide was established in 1857 by John Torrey in Reports of explorations and surveys: to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean, made under the direction of the Secretary of War , 4 (5), Pp. 139–140. Type species is Hesperocnide tenella Torr.

The scientific generic name Hesperocnide is derived from the Greek terms hespera for western and knide for nettle. This is an allusion to the distribution of Hesperocnide tenella on the west coast of North America.

The genus Hesperocnide includes the two species:

Hesperocnide sandwicencis Wedd.
Hesperocnide tenella Torr.

literature

David E. Boufford: Hesperocnide - online with the same text as the printed work. Flora of North America Editorial Committee (Ed.): Flora of North America North of Mexico , Volume 3 - Magnoliidae and Hamamelidae , Oxford University Press, New York a. a. 1997, ISBN 0-19-511246-6 .
Warren L. Wagner, Derral R. Herbst, SH Sohmer: Manual of the Flowering Plants of Hawaii . University of Hawaii Press, 1999, ISBN 0-8248-2166-1 .

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s David E. Boufford: Hesperocnide - online with the same text as the printed work. Flora of North America Editorial Committee (Ed.): Flora of North America North of Mexico , Volume 3 - Magnoliidae and Hamamelidae , Oxford University Press, New York a. a. 1997, ISBN 0-19-511246-6 .
^ Warren L. Wagner, Derral R. Herbst, SH Sohmer: Manual of the Flowering Plants of Hawaiʻi . University of Hawaii Press, 1999. ISBN 0-8248-2166-1
↑ First publication scanned at biodiversitylibrary.org .
↑ Hesperocnide at Tropicos.org. Missouri Botanical Garden, St. Louis

Web links

Commons : Hesperocnide - collection of images, videos and audio files

[FoNA-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s David E. Boufford: Hesperocnide - online with the same text as the printed work. Flora of North America Editorial Committee (Ed.): Flora of North America North of Mexico , Volume 3 - Magnoliidae and Hamamelidae , Oxford University Press, New York a. a. 1997, ISBN 0-19-511246-6 .

[MoFPoH-2] Warren L. Wagner, Derral R. Herbst, SH Sohmer: Manual of the Flowering Plants of Hawaiʻi . University of Hawaii Press, 1999. ISBN 0-8248-2166-1

[biodiversitylibrary-3] First publication scanned at biodiversitylibrary.org .

[tropicos-4] Hesperocnide at Tropicos.org. Missouri Botanical Garden, St. Louis