Taxonomy of Angiosperms#A few imp characters and respective families

1.Gynobasic style :  Lamiaceae ; a style arising directly from the thalamus  of the flower.

2.Gynandrium: Orchodaceae ; a column like structure formed by union of stamens , style and stigma.

3. Pulvinus: Mimosaceae,Caesalpiniaceae, Papilionaceae ; a minute gland  or swollen base of petiole .

4. Interpetiolar stipule : Rubiaceae ; when two stipules lye between the two leaves.

5.Intrapetiolar stipule: stipules present at the axis of the leaf .

(Stipules are a pair of appandages present at the zone of attachment of leaf on the stem).

6.Foliaceous stipule : Papilionaceae; stipules modified to leaf like structure.

7.Cauline: Brassicaceae;  leaves borne on the main stem .

8.Ramal: leaves borne on lateral branches.

9.Radical:  Brassicaceae ; leaves borne on extremely reduced stem .

10. Lodicules :  Poaceae : highly modified perianth as minute, hyaline and  fleshy structure.

11. Lemma :Poaceae; flowering glume .

12. Palea: Poaceae : a membrane-like binerved or bikeeled structure present in between lemma and rachila.

13. Caryopsis : Poaceae ; a small, dry , indehiscent , fruit in which seed coat / ovary wall adheres to fruit wall.

14.Basal placentation :  Asteraceae , Poaceae ; when placenta placed on the base / floor of the ovary chamber .

15 Feathery stigma : Poaceae ; when stigma appears feather like to assist the pollination process .

14.Labellum : Orchidaceae ; the median and highly modified  tepal of the inner whorl of an orchid .

15.Rostellum: Orchidaceae ; in case of a monandrous orchid rostellum is a special organ representing the third stigma.

16.Pappus: Asteraceae; these  hairy or bristly structures are the modified sepals .

17.Cruciform corolla : Brassicaceae ; the crosswise arrangement of four clawed petals of a whorl .

18.Reniform anther : Malvaceae ; kidney shaped anther.

19.Syngenesious stamens:Asteraceae ; filaments of 5 stamens are free but their anthers united into a bundle .

20.Synandrous stamen: Cucurbitaceae ; all stamens united thorought their length by both the filaments and the anthers .