Notes on Angiosperm Morphology and Taxonomy

 ANGIOSPERM MORPHOLOGY

·         Some of them have xylem vessels in their wood

·         Scutellum in Monocots: Scaly haustorial embryonic leaf

·         Gynostegium relates to Fusion of stamens with gynoecium

·         In Wheat and rice : Pericarp is fused with seed coat

·         Leaf of Tamarindus indica is Paripinnate

·         In Smilax tendrils are Modified stipules

·         Cladode -Asparagus

·         Phylloclade - Opuntia

·         Leaf tendril -Gloriosa

·          Stem tendril – Passiflora

·         Stem tuber- potato

·         Angiosperm: Heterosporous, Male gametes are non motille

·         Protandrous:  Androecium matures first

short notes on plant morphology

Fruits

Samara fruit- Dioscorea

Inflorescence

Hypanthodium- Ficus

Sorosis - Jack fruit

Spike- Achyranthus

Spike - Ophioglossum

Hesperidium- Citrus sinensis

Capitulum consist of Ray florets and disc florets

Aggregate fruits - Annonaceae (Custard Apple)

 

Cyathium -Male flowers represented by stalked stamens

Caryopsis - Poaceae

 

Umbel- Flowers with stalks of equal length (Apiaceae)

Siliqua - Brassicaceae

Corymb - Older and younger flowers have stalks of different lengths

The dry, one seeded and indehiscent fruit with the pericarp and testa does not rupture when they fall on ground. The pericarp is membranous or leathery and free from seed coat or testa is known as: Achene

Hypanthodium - Peduncle is modified to a pear shaped structure

 

Legume : One chambered dry dehiscent fruit that dehisces along  the sutures

 Legume - Fabaceae

The characteristic type of inflorescence of the Genus Arisaema : Spadix

Cyathium -Euphorbiaceae

 

 

Cypsela-Helianthus annuus

 

 

Plant Taxonomy Short Notes

Family

Asclepidceae

Pollinia

Myrtaceae

Ranunculaceae

Melastomaceae

Verbanaceae rarely gynobasic

Magnoliaceae

Cucurbitaceae

Capparidaceae

Rubiaceae

Paracytic stomata

Polygalaceae

Asteraceae

Syngenecious anthers are present

Cryophyllaceae

Asclepiadaceae

Malvaceae

Monothecous anther

Liliaceae

Commelinaceae

Arecaceae

Araceae

Orchidaceae

 Cyperaceae

Boraginaceae

 Poaceae

The scaly membraneous perianth of graminae is  lodicule

Leguminosae

6 subfamilies

Scitamineae

Amaranthaceae

Lamiaceae

Gynobasic style - Leucas aspera

Verticellaster

Euphorbiaceae

Dipterocarpacae

Trifid style

Nymphaceae

Laminar stamen

Brassicaceae

Siliqua is the characteristic fruit

Podostemaceae

families is pseudo embryo sac present

·         Oblique placentation - Asclepiadaceae

·         Pollinium - Solanaceae

 

·         Apocarpous pistil -Artabotrys odoratissimus

·         Petals are absent in Saraca Asoca

·   Chenopodiaceae, Portulacaceae, Aizoaceae, Cactaceae, Nyctaginaceae, Phytolaccaceae, Stegnospermaceae, Basellaceae, Amaranthaceae and Didieraceae, which have been placed under a single, order Centrospermae based on the chemotaxonomic marker Betalins. 

·         Solanaceae: Carpels 2, syncarpous in an obliquely placed superior ovary indicate

·         Family having the ability to produce cyanogenic glycosides as a chemotaxonomic marker character:  Rosaceae , Leguminosae, Poaceae

·         Trees with resin; coracious leaves; flower actionomorphic, hermaphrodite, sepals 5, polysepalous, persistent; petals 5, polypetalous; stamens many in one to several whorls, slightly polyandrous, carpels 3, syncarpous, superior; Fruit samara with persistent sepals :  Dipetrocarpaceae

·         Gigantic trees with an abundant resin; coracious leaves; flower actionomorphic, hermaphrodite, hypogynous; sepals 5, polysepalous, persistent; petals 5, polypetalous; stamens many in one to several whorls, slightly polyandrous, carpels 3, syncarpous, superior; Fruit samara enclosed in persistent sepals: Dipetrocarpaceae

·         Verbanaceae: Gynoecium is bicarpellary, superior, Ovary-2-4-celled, placentation axile, ovule 1 or 2 in each loculus, Style-Simple, terminal, rarely gynobasic

·         Polygalaceae: Flowers are irregular and bisexual, 5 sepals but usually 3 green outer sepals and 2 petallike inner sepals. United petals, usually fused with the stamens, and the lower petal is often fringed. There are 8 stamens, fused to the petals. The ovary is positioned superior. It consists of 2 united carpels with the partition walls present, forming an equal number of chambers. It matures as a capsule, nut, or drupe

·         Actinomorphic, pentamerous, hypogynous flowers with monadelphous stamen are characterstic features of Malvaceae

·         The family/families possess(es) accessory vascular bundles in the pith – medullary bundles, and in the cortex- cortical bundles either in rings or irregularly: Amaranthaceae and Nyctaginaceae

·         Labellum in Orchidaceae comes to anterior side by the twisting of the ovary through 1800. This process is called Resupination


·         Poaceae - Gramineae

·         Fabaceae – Papilionaceae (Marginal placentation)

·         Lamiaceae - Labiatae

·         Brassicaceae – Cruciferae

·         Guttiferae -Clusiaceae

·         Asteraceae- Rubiaceae

 

·         Unilocular Ovary - Sunflower

·         Bilocular Ovary -  Petunia

·         Trilocular Ovary- Asparagus

·         Pentalocular Ovary –Hibiscus

Economic Botany  

·         Asafoetida - Ferula

·         White dammar -Vateria.

·         Rose wood  - Dalbergia

·          Para rubber - Hevea 

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