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Golden Alexanders


Golden Alexanders
Photo Information
Copyright: John Denk (jpdenk) Gold Star Critiquer/Gold Note Writer [C: 307 W: 3 N: 74] (333)
Genre: Plants
Medium: Color
Date Taken: 2012-05-08
Categories: Flowers
Camera: Nikon D90, 60mm f/2.8D AF Micro Nikkor
Exposure: f/16, 1/200 seconds
More Photo Info: [view]
Photo Version: Original Version
Theme(s): Plants of the Chicago region [view contributor(s)]
Date Submitted: 2012-05-08 14:56
Viewed: 3099
Points: 4
[Note Guidelines] Photographer's Note
Golden Alexanders, Zizea aurea, is a perennial wildflower typically found in prairie remnants as well as open woods or openings in woods over approximately the eastern 2/3 of North America. It prefers slightly moist soil but also occurs in mesic soils. It typically begins blooming in late April or early May where I live.

This was photographed in the Bartel Grassland south of Chicago. I think this may be a new species on TREKNATURE.

Kingdom-Plantae – Plants
Subkingdom-Tracheobionta, Vascular plants
Superdivision-Spermatophyta, Seed plants
Division-Magnoliophyta, Flowering plants
Class-Magnoliopsida, Dicotyledons
Subclass-Rosidae
Order-Apiales
Family-Apiaceae, Carrot family
Genus-Zizia W.D.J. Koch – zizia
Species- Zizia aurea (L.) W.D.J. Koch

Information from the "Illinois Wildflowers" site:

Description: This native perennial plant is up to 2½' tall, forming occasional lateral stems. These stems are light green, hairless, and rather shiny. The shiny compound leaves are medium green, hairless, and odd-pinnate with 3 or 5 leaflets. The lower compound leaves have long petioles, which become shorter as the leaves alternate upward along the stems. The variable leaflets are up to 3" long and 2" across; they are lanceolate, ovate, cordate, or broadly oblong in shape, although the larger leaflets sometimes have 1-2 cleft lobes. Leaflet margins are serrated.

Flat to slightly rounded compound umbels of yellow flowers occur at the ends of the upper stems. Each compound umbel is about 2-3" across, and consists of about 12 umbellets. There are about 21 flowers in each umbellet; the central flower of each umbellet is sessile (or nearly so) during the blooming period. Each flower is about 1/8" across; it has 5 incurved yellow petals, an insignificant calyx, a pistil, and 5 stamens. The blooming period occurs from late spring to early summer, and lasts about 1 month. There is no floral scent. The seeds are oblong and flattened, but not winged, with several lighter-colored longitudinal ridges. The root system consists of a dense cluster of coarse fibrous roots.

Range & Habitat: Golden Alexanders is occasional to locally common in most areas of Illinois, except for some southern and western counties, where it is uncommon or absent. Habitats include moist black soil prairies, openings in moist to mesic woodlands, areas along woodland paths, savannas, thickets, limestone glades, thinly wooded bluffs, powerline clearances in wooded areas, and abandoned fields. Golden Alexanders occurs in both degraded and higher quality habitats. It adapts readily to habitat restorations.

Faunal Associations: The flowers are attractive to many kinds of insects seeking pollen or nectar, especially short-tongued bees, wasps, flies, and beetles. Among the short-tongued bees are such visitors as Green Metallic bees, Masked bees, and Andrenid bees (including the oligolege, Andrena ziziae). Wasp visitors include Eumenine wasps, spider wasps, Ichneumonid wasps, and Crabronine wasps. Such long-tongued bees as bumblebees, cuckoo bees (Nomada spp.) also visit the flowers, as do some small butterflies and true bugs. Notwithstanding all of these visitors, this plant is capable of self-pollination. Caterpillars of the butterflies Papilio polyxenes asterius (Black Swallowtail) and Papilio joanae (Ozark Swallowtail) feed on the leaves and flowers, while caterpillars of Papaipema rigida (Rigid Sunflower Borer Moth) bore through the stems. Two aphids, Aphis saniculae and Aphis thaspii, suck plant juices from Golden Alexanders and similar species in the Carrot family.

Comments: Golden Alexanders should not be confused with Pastinaca sativa (Wild Parsnip), which is a weedy Eurasian biennial. The latter is taller, blooms later, and has more leaflets in each compound leaf. It can be particularly difficult to distinguish Golden Alexanders from Thaspium trifoliatum aureum (Yellow Meadow Parsnip), which is another native perennial plant. For the latter plant, the central flower of each umbellet has a short pedicel, the achenes are winged, and its basal leaves are simple, rather than trifoliate. Otherwise, these two species share nearly the same characteristics. Golden Alexanders is an excellent addition to a wildflower garden because it provides accessible nectar to many beneficial insects with short mouthparts during the spring and early summer when such flowers are relatively uncommon.

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To Pitoncle: Thanksjpdenk 1 05-09 07:52
To tuslaw: Thanksjpdenk 2 05-08 19:57
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Critiques [Translate]

  • Great 
  • tuslaw Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2752 W: 280 N: 4931] (19883)
  • [2012-05-08 18:59]
  • [+]

Hello John,
A great shot of this interesting yellow plant. When I first viewed your photo I thought..yep, I've seen this plant before. I then read your notes and now I'm not so sure, I may have been seeing Wild Parsnips.
Very attractive composition and showing excellent detail. I see you even managed to capture a type of fly as well as a tiny bee. Great work!!
Ron

Bonjour John,
Agréable macro valorisant relativement bien le sujet.
A bientôt sur TN pour de nouvelles aventures.
Gérard

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