For clarity and consistency botanists usually describe plants in standard sequence. This is the sequence used by the Flora of North America. I don't use this format on this website, but I think it's helpful for learning how to look at and describe plants. I do use it informally when I'm taking notes for myself, if only to make sure I don't miss anything.
Quick reminder of sequence of structures
RULE OF THUMB: Work from bottom up and outside in. Place proximal before distal, abaxial before adaxial, staminate before pistillate.
Plant growth form (e.g., trees, shrubs), duration (e.g., annual, biennial), nutrition (e.g., parasitic)
Roots and/or other belowground parts
Stems
Primary stems
Trunks
Bark
Wood
Branches, shoots, twigs
Buds
Leaves
Stipules
Petiole
Sheath, ligule
Blade (base, margins, apex)
Lobes
Higher-order axes and petioles
Leaflets
Scape (if described, belong in separate boldfaced sentence)
Inflorescences
Peduncle
Branches
Bracts
Different flower types
Pedicel (if described, belong in separate boldfaced sentence)
Flowers
Receptacle and hypanthium
Perianth (tepals) or calyx (sepals) and/or corolla (petals)
Corona (corolla tube; lobes; limbs)
Glands and/or discs
Androecium at flowering time (stamens; anthers)
Gynoecium at flowering time (ovary; placentation; style; stigma)
Fruits
Aggregation of or subdivision within fruit
Mericarp, accessory structures, multiple fruit structures
Seeds
Endosperm
Embryo