Plant Structure & Anatomy
Start with cannabis as a plant: organs, tissues, growth points, leaves, stems, flowers, and the structures that support growth.
Published lessons
These pages are organized here by subject. The permanent THC-ENC IDs remain stable behind the scenes even when a clearer display title is used.
Taxonomic Debate: One Species, Multiple Lineages
Separate formal botanical taxonomy from ancestry, population structure, pedigree, morphology, chemotype, and retail labels.
Domestication, Dispersal, and Human Selection
Separate evidence about domestication history from the present native-range record and modern commercial origin stories.
Annual Growth Habit and the Whole-Plant Life Cycle
Follow cannabis development by biological stage instead of treating calendar week numbers as universal deadlines.
The Cannabis Achene: What Growers Call a Seed
Understand the planted cannabis unit as a dry one-seeded fruit and separate fruit-wall anatomy from the true seed and embryo.
Embryo, Cotyledons, Radicle, Hypocotyl, and Plumule
Trace the embryonic structures that become the seedling root and shoot system during germination and emergence.
Root System Architecture
Understand the primary root, lateral roots, fine roots, root hairs, and root-zone conditions that shape a changing absorption system.
Stem Anatomy and Vascular Transport
Connect cannabis stem tissues to mechanical support and the movement of water, minerals, sugars, and signals through the plant.
Nodes, Internodes, and Branch Attachment
Use nodes, internodes, and branch order as repeatable plant-architecture measurements rather than vague descriptors.
Leaf Morphology, Leaflets, and Phyllotaxy
Describe cannabis leaves accurately and use changes in leaf form as observations rather than instant diagnoses.
Meristems, Buds, and Apical Dominance
Explain how shoot meristems produce new organs and why removing or bending an apex changes branching.
Primary Growth, Secondary Thickening, and Structural Support
Distinguish length growth from stem thickening and connect both to plant loading and support.
Dioecy, Monoecy, and Sexual Plasticity
Use correct terms for plant sex systems and distinguish stable monoecy from intersex expression.
Male Flower and Inflorescence Anatomy
Identify the principal structures of staminate flowers and explain their role in pollen production and release.
Female Flower, Bract, Stigma, and Inflorescence Anatomy
Identify female reproductive structures without using the colloquial word “calyx” for every surrounding tissue.
Wind Pollination, Fertilization, and Seed Set
Trace pollen from release through stigma contact, fertilization, embryo development, and mature achene formation.
Glandular and Nonglandular Trichome Classes
Differentiate the major trichome classes and connect structure, location, development, and sampling.
Morphological Measurement and Botanical Recordkeeping
Turn plant appearance into consistent, comparable, and searchable data.