The ANITA grade and the Magnoliid Complex Spring 2012.
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Transcript of The ANITA grade and the Magnoliid Complex Spring 2012.
![Page 1: The ANITA grade and the Magnoliid Complex Spring 2012.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649db05503460f94a9ee53/html5/thumbnails/1.jpg)
The ANITA grade and the Magnoliid Complex
Spring 2012
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Major Angiosperm Clades
Amborellaceae
Nymphaeales
Austrobaileyales
MAGNOLIID COMPLEX
MONOCOTS
EUDICOTS [TRICOLPATES]
ANITA
GRADE
Soltis et al. 2000, APG II 2002, Judd et al. 2002
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Angiosperm Evolution: Pollen
• Basic division in distinguishing angiosperms is NOT monocot versus dicot!!
• Basic distinction is the number of pores or sulcae (grooves) in the pollen grains.
• Trends in pollen evolution clearly show a shift from uni-aperturate pollen found in gymnosperms and the “basal” angiosperms to tria-perturate pollen found in the more derived flowering plants.
• Plesiomorphic condition in angiosperms is uni-aperturate.
• Fossil record is quite good to document this transformation in pollen type.
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monoaperturate pollen (one pore or groove)
Fig. 7.1
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Pollen Types
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Fig. 7.1
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“Basal” Angiosperms:Amborellaceae (Amborella Family)
Amborella trichopoda
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Fig. 7.1
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“Basal” Angiosperms:
Nymphaeaceae(Water Lily Family)
• Widespread, tropics to temperate regions
• Aquatic rhizomatous herbs, sap milky
• Ca. 70 species; 5-6 genera
• Flowers: many parts; laminar stamens; floating; colorful perianth; beetle pollination syndrome
• Special uses: ornamentals
• Required taxa: Nymphaea (water lily)
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“Basal” Angiosperms:Nymphaeaceae (Water-lily Family)
•numerous petals, stamens, carpels•laminar stamens•pollen monosulcate•stigma discoid, radiating•berry-like fruit, dehiscent•perisperm (from the sporophyte)•usually lack vessels (or have tracheid-like vessels)
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Nymphaea odorata – Water Lily
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Beetle pollination syndrome
• Flowers often green or white
• Flowers with various but strong scents
• Can open during the day or night
• Flowers open or enclosed
• Nectar and/or pollen reward
• See Ch. 13 in Simpson
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Nymphaea tuberosa Water Lily
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NupharWater Lily
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Victoria amazonica – Giant Water Lily
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Major Angiosperm Clades
Amborellaceae
Nymphaeales
Austrobaileyales
MAGNOLIID COMPLEX
MONOCOTS
EUDICOTS [TRICOLPATES]
ANITA
GRADE
Soltis et al. 2000, APG II 2002, Judd et al. 2002
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Fig. 7.1
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Magnoliid characters“Magnocots”
•2-ranked leaves, paracytic stomates•Perianth generally 3-merous•Stamens and carpels: distinct, numerous, spirally arranged •Boat-shaped, monosulcate pollen•Superior ovary•Seeds with fleshy seed coat/aril in many; minute embryo, copious endosperm•Many anatomical characters (esp. wood)
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Magnoliids—Magnoliales:
Magnoliaceae(The Magnolia Family)
• Temperate to tropical regions of eastern North America; east Asia, South America• Trees or shrubs with simple leaves• Number of species: 2 or 7 genera, 200
species• Flowers: apocarpous; anthers laminar, large
number; receptacle elongated• Significant features: Aromatic; fruit an
aggregate of follicles in Magnolia or winged samaras in Liriodendron• Special uses: ornamentals; timber• Required taxa: Magnolia
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Magnoliaceae
Magnolia virginianasweetbay
•woody plant
•simple leaves
•stipules
•many spirally
arranged parts
•separate carpels
•laminar stamens
•solitary flower
•elongate receptacle
•aggregate of follicles
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Magnolia X soulangeana
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Magnolia
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Within the family,Magnolia is diagnosed by:-presence of a red or orange fleshy seed coat-follicles opening along the abaxial seam
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Liriodendron tulipiferaTulip Poplar Tree
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Other Magnoliid families of interest (but not required)
• Lauraceae (the laurel or bay family)
• Piperaceae (the pepper family)
• Aristolochiaceae (the birthwort family)
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Magnoliids—Laurales:
Lauraceae(Laurel or Bay Family)
• Widespread in tropical and subtropical regions; SE Asia & northern South America
• Trees, shrubs, vines.
• Diversity: 2,200 species, 45 genera
• Flowers: concave receptacle that often enlarges in fruit; anthers dehiscing via pores with flaps; sticky pollen; pollen without apertures; carpel 1; embryo large, endosperm lacking.
• Significant features: ethereal oils
• Special uses: cinnamon (Cinnamomum) and bay (Laurus nobilis) used as spices; avocado (Persea)
• Family not required
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Sassafras albidum
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Lauraceae
Cinnamomumcinnamon
Enlarged receptacle under the drupe!
Sassafras albidumsassafras
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LauraceaeEconomic plants and products:
Cinnamomum zeylandicumTrue cinnamon
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Bird dispersal andecological role ofLauraceae
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Magnoliids—Piperales:
Piperaceae• Widely distributed in tropical and subtropical
regions.
• Primarily herbs; sometimes epiphytic; small trees
• Diversity: 3,600 species, 5 genera
• Flowers: minute, densely packed in a thick spike or spadix; no perianth (!); carpels 1-4, connate, with 1 ovule per gynoecium, basal placentation; fruit usually a drupe.
• Significant features: stem with bundles in >1 ring or + scattered
• Special uses: Piper nigrum (black pepper); Piper betle (betel pepper), ornamentals (Peperomia)
• Family not required
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Peperomia
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Peperomia leaves
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Piper nigrum – Black pepper
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Magnoliids—Piperales:
Aristolochiaceae(Dutchman’s Pipe or Birthwort Family)
• Widespread in tropical and subtropical regions; absent in Australia.
• Lianas or herbs, occasionally shrubs• Diversity: ca. 460 species, 7 genera• Flowers: Highly modified, showy, fused sepals,
radial or bilateral, tubular, and S-shaped or pipe shaped calyx tube; corolla usually lacking or vestigial; ovary inferior or half-inferior, of 3-6 connate carpels; ovules numerous; filaments more or less adnate to style.
• Significant features: “dead meat” carrion coloration attracts insects, usually flies. Trap-flowers.
• Special uses: ornamentals; some medicinal uses.• Family not required
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Asarum (wild ginger)
-stemless perennial with aromatic rhizomes-flowers actinomorphic-filament tips extending beyond the anthers-ovary inferior-fruit a fleshy capsule, seeds large
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Characters of Aristolochia
• Tropical or warm temperate regions• Perennial herbs or shrubs, twining or
climbing or sometimes upright• Calyx tubular, greenish or purplish• Anthers sessile, strongly adnate to the
short and fleshy style• “trap” flowers
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On to the monocots…
...clearly monophyletic…superbly apomorphic! ! !