- Dactylorhiza maculata
- Dalibarda repens
- Danae racemosa
- Daphne cneorum
- Daphne gnidium
- Daphne laureola
- Daphne mezereum
- Daphne pontica
- Dasiphora fruticosa
- Dasypyrum villosum
- Date palm
- Date-plum
- Datura metel
- Datura stramonium
- Daucus carota
- Decodon verticillatus
- Delphinium elatum
- Delphinium grandiflorum
- Delphinium staphisagria
- Dendrobium moniliforme
- Descurainia sophia
- Desmodium canadense
- Dianthus alpinus
- Dianthus armeria
- Dianthus barbatus
- Dianthus carthusianorum
- Dianthus caryophyllus
- Dianthus chinensis
- Dianthus deltoides
- Diapensia lapponica
- Dicentra cucullaria
- Dictamnus albus
- Digitalis ferruginea
- Digitalis lutea
- Digitalis purpurea
- Digitalis thapsi
- Dill
- Dillenia indica
- Dimorphotheca pluvialis
- Dioscorea alata
- Dioscorea bulbifera
- Dioscorea communis
- Dioscorea oppositifolia
- Dioscorea pentaphylla
- Dioscorea villosa
- Diospyros lotus
- Diospyros virginiana
- Diphasiastrum alpinum
- Diphasiastrum complanatum
- Diplotaxis muralis
- Dipsacus fullonum
- Dipsacus laciniatus
- Dipsacus pilosus
- Dirca palustris
- Distichlis spicata
- Dittrichia viscosa
- Dodecatheon meadia
- Doronicum plantagineum
- Dorstenia contrajerva
- Draba verna
- Dracocephalum moldavica
- Dragon's mouth
- Drimia maritima
- Drosera capensis
- Drosera indica
- Drosera rotundifolia
- Drosophyllum lusitanicum
- Dryas octopetala
- Dryopteris cristata
- Dryopteris filix-mas
- Dryopteris marginalis
- Drypis spinosa
- Dulichium arundinaceum
- Duranta erecta
- Dysphania ambrosioides
- Dysphania botrys
- Dysphania multifida
Digitalis purpurea
- Foxglove (Digitalis spp.)
- Usage: Used for heart problems. Is effective, but:
- Whether or not a given quantity of digitalis contains enough digoxin to lead to an overdose depends on the individual plant(s) it's from (each individual plant (even in the same species) has a different digoxin content) so those using digitalis are effectively playing Russian roulette. There is no way of knowing if one pill is good, or if it will lead to an overdose and kill you. As Encyclopedia.com puts it:
Foxglove is no longer used as a heart medicine because the therapeutic dose and the lethal dose are very close. Seasonal variations in the level of cardiac glycosides in the plant make the safe dose impossible to estimate except by an experienced physician and prescriber of the herb who monitors the patient on an hourly basis for signs of overdose. Few living doctors and herbalists can safely use digitalis as a plant extract. Specific standardized doses of pharmaceutical digoxin are used instead.<wiki/List_of_medicinal_plants#cite_note-98">
- The solution is to use pure digoxin, if prescribed by a doctor, because the doses are exactly measured.
- Harmful effects: Side effects may include irregular heart function and death.<wiki/List_of_medicinal_plants#cite_note-Digitalis-99"> Symptoms of digitalis overdose may include "stomach upset, small eye pupils, blurred vision, strong slow pulse, nausea, vomiting, dizziness, excessive urination, fatigue, muscle weakness and tremors, stupor, confusion, convulsions, abnormal heartbeats, and death. Long-term use of digitalis can lead to symptoms of toxicity, including visual halos, yellow-green vision, and stomach upset."<wiki/List_of_medicinal_plants#cite_note-Digitalis-99"> "Even touching the plant with bare skin has been known to cause rashes, headache, and nausea."<wiki/List_of_medicinal_plants#cite_note-theherbbook-7">
Datura stramonium
- Jimson weed (Datura stramonium)
- Used for: spasmodic coughing, chronic laryngitis, asthma; used as an aphrodisiac in South America<wiki/List_of_medicinal_plants#cite_note-theherbbook-7">
- Insufficient evidence to evaluate efficacy.<wiki/List_of_medicinal_plants#cite_note-jim-137"> Jimson weed leaves are smoked for asthma.<wiki/List_of_medicinal_plants#cite_note-138">
- Harmful effects: Jimson weed is poisonous and can cause dry mouth and extreme thirst, vision problems, nausea and vomiting, fast heart rate, hallucinations, high temperature, seizures, confusion, loss of consciousness, breathing problems, and death.<wiki/List_of_medicinal_plants#cite_note-jim-137"> "The deadly dose for adults is - grams of leaf or - grams of the seeds."<wiki/List_of_medicinal_plants#cite_note-jim-137">
Drimia maritima
- Squill (Drimia maritima)
- Not enough research to evaluate efficacy for anything.<wiki/List_of_medicinal_plants#cite_note-squill-202"> Used for heart problems, bronchitis, asthma, whooping cough, and wounds.
- Harmful effects: The herb is cardiotoxic and can be lethal, with side effects including stomach irritation, loss of appetite, diarrhea, vomiting, headache, vision changes, depression, confusion, hallucinations, irregular heartbeat, skin rash, miscarriages, seizures, life-threatening abnormal heart rhythms, and death.<wiki/List_of_medicinal_plants#cite_note-squill-202">
Dionaea muscipula
- Venus fly-trap (Dionaea muscipula)
- Active ingredient plumbagin, claimed to boost the immune system
- Harmful effects: Possible side effects of plumbagin are diarrhea, skin rash, liver damage, and abnormal blood counts.<wiki/List_of_medicinal_plants#cite_note-211"> Plumbagin is mutagenic to Escherichia coli.<wiki/List_of_medicinal_plants#cite_note-212">