{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.leaf","code":"thing-q33971","url":"https://ver.cy/models/thing/q33971/","name":"leaf","alternateNames":["Cymbopogon citratus leaf","nettle leaf","beet","coffee leaf","bay leaf","honeysuckle leaves","daisy leaf","mint leaf","perilla leaf","Senna leaf","skeleton leaf","palm leaf"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.LIV"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"The flattened, usually green organ of a vascular plant attached to the stem, specialised for photosynthesis and gas exchange; leaves of many plants are also used as food, herbs and tea.","purpose":"Let an agent handle leaves by plant, form, function, identification and use, with cautions about toxic plants.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Plant organ for photosynthesis","Diverse shapes used in identification","Deciduous or evergreen","Some leaves are toxic"],"structure":{"bundles":[{"id":"identification","name":"Identification","description":"Which leaf.","layers":[{"id":"form","name":"Form","description":"Shape and margin.","findings":[{"id":"form-finding","name":"Form","description":"Leaf form.","questions":[{"text":"What are the leaf shape, margin and venation?","kind":"definition"},{"text":"Simple or compound?","kind":"definition"}]}]},{"id":"plant","name":"Plant","description":"Species.","findings":[{"id":"plant-finding","name":"Plant","description":"Plant species.","questions":[{"text":"Which plant does the leaf come from?","kind":"provenance"},{"text":"Is it confirmed by an expert or key?","kind":"provenance"}]}]}]},{"id":"function","name":"Function","description":"Biology.","layers":[{"id":"photosynthesis","name":"Photosynthesis","description":"Energy.","findings":[{"id":"photosynthesis-finding","name":"Photosynthesis","description":"Photosynthesis.","questions":[{"text":"How does the leaf capture light and exchange gases?","kind":"definition"},{"text":"What adaptations does it show?","kind":"definition"}]}]},{"id":"health","name":"Plant health","description":"Symptoms.","findings":[{"id":"health-finding","name":"Plant health","description":"Leaf symptoms.","questions":[{"text":"What do yellowing or spots on the leaf indicate?","kind":"definition"},{"text":"Should a plant health authority be told?","kind":"boundary"}]}]}]},{"id":"use","name":"Use","description":"Food and herbs.","layers":[{"id":"food","name":"Food","description":"Edible leaves.","findings":[{"id":"food-finding","name":"Food","description":"Edible use.","questions":[{"text":"Is the leaf edible, and how is it prepared?","kind":"boundary"},{"text":"Could it be confused with a toxic plant?","kind":"boundary"}]}]},{"id":"tea","name":"Tea and herbs","description":"Infusions.","findings":[{"id":"tea-finding","name":"Tea","description":"Infusions.","questions":[{"text":"Is the leaf used as tea or herb?","kind":"definition"},{"text":"Are there health warnings?","kind":"boundary"}]}]}]},{"id":"seasons","name":"Seasons","description":"Leaf fall.","layers":[{"id":"autumn","name":"Autumn","description":"Colour and fall.","findings":[{"id":"autumn-finding","name":"Autumn","description":"Leaf fall.","questions":[{"text":"Why do leaves change colour and fall?","kind":"definition"},{"text":"When?","kind":"measurement"}]}]},{"id":"litter","name":"Litter","description":"Compost and safety.","findings":[{"id":"litter-finding","name":"Litter","description":"Leaf litter.","questions":[{"text":"How can fallen leaves be composted?","kind":"action"},{"text":"How are slippery paths managed?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Identify leaves and the plants they come from, stating confidence.","Monitor leaves for disease, pests or stress for a grower who authorized it."],"mustNot":["Advise eating leaves of a plant identified only from an image.","Recommend leaf remedies as treatment for disease.","Collect leaves of protected plants without permission."],"requiresHuman":["Spraying or removing plants because of leaf symptoms."]},"ethics":{"considerations":["Misidentified leaves can poison people and animals.","Traditional plant knowledge belongs to the communities that hold it."],"affectedParties":["Foragers and consumers","Growers","Plants and ecosystems"]},"owners":{"steward":"Whoever owns the plant; protected species are under conservation authorities.","roles":[],"masterSystems":[]},"relations":[{"target":"Q24060707","type":"parent","note":"registry parent class"},{"target":"plant organ","type":"related","note":"category"},{"target":"plant","type":"related","note":"whole"},{"target":"photosynthesis","type":"related","note":"function"},{"target":"herb and tea","type":"related","note":"uses"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.leaf","Wikidata: Q33971 (https://www.wikidata.org/wiki/Q33971)"]},"properties":{"applicability":"required","items":["blade length: millimetres to over 2 m - duckweed to palms"]},"recognition":{"applicability":"required","items":["Shape, margin, venation and arrangement","Simple or compound","Culinary leaves such as bay or nettle","Flat green blades on stalks, in countless shapes, sizes and arrangements."]},"capabilities":{"applicability":"required","items":["identify plants from leaves","harvest culinary leaves","diagnose plant health from leaves","compost fallen leaves"]},"hazards":{"applicability":"required","items":["Eating toxic leaves from misidentified plants","Pesticide residues","Slippery leaf litter on paths"]},"interfaces":{"applicability":"required","items":["Plant health rules for imported plant material","Food safety rules for leafy produce"]},"context":{"applicability":"required","items":["Photosynthesis and transpiration; for people, food, herbs, tea and medicine.","simple leaves","compound leaves","needles and scales","modified leaves such as spines and tendrils","culinary and tea leaves"]}},"sources":[{"title":"Wikidata item Q33971: leaf","url":"https://www.wikidata.org/wiki/Q33971","note":"identity and sense of the item"},{"title":"Wikipedia: Leaf","url":"https://en.wikipedia.org/wiki/Leaf","note":"general description of the item"}],"openQuestions":["Should leaf types be separate entries?","How should culinary leaves be linked?","How should identification keys be linked?"],"resources":{"spec":"/models/things/publications/thing-q33971/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q33971/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T07:34:03Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-06T19:51:59+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}