- Backyard Gardener: Heliotropium aborescens (Iowa Heliotrope)
- Provides data on the distinguishing characeristics of the plan. Includes care tips, watering and fertilizing.
- Desert Tropicals: Heliotrope, Cherry Pie
- Contains information on the general characteristics of the plant. Includes growth habits, blooming habits and images.
- Florabase: Ehretia
- Contains information on the identity of the plant. Includes reproduction, Inflorescence and flower features, fruit and seed features.
- Florabase: Heliotropium indicum L.
- Contains information on the identity of the plant. Includes reproduction, Inflorescence and flower features, fruit and seed features.
- Floridata: Heliotropium arborsecens
- Provides information on the properties of the plant. Includes culture, distribution, propagation and images.
- Gardening Eu: Ehretia dicksonii
- Contains information on the general characteristics of the plant. Includes exposure, treatments and development.
- Missouri Botanical Garden: Heliotropium arborescens
- Provides information on the distinguishing properties of the plant. Includes culure, noteworthy characteristics, problems and uses.
- Missouriplants: Heliotropium indicum L. - Indian Heliotrope
- Provides information on the distinguishing characteristics of the plant. Includes habitat, flowering and photos.
- Plants For a Future: Ehretia acuminata - R.Br. Koda Tree
- Provides information on the physical characteristics of the plant. Includes habitat, uses, cultivation and propagation.
- Plants For a Future: Heliotropium arborescens - L.Heliotrope
- Provides information on the physical characteristics of the plant. Includes habitat, uses, cultivation and propagation.
- PlantzAfrica.com: Ehretia rigida
- Contains information on the distinguishing of the plant. Includes history, distribution, ecology, cultural value and images.
- Stuartxchange: Tsaang gubat - Ehretia microphylla Lam.
- Contains information on the botany, distribution, uses and availability. With photos.
- United Sates Department of Agriculture: Heliotropium curassavicum L. salt heliotrope
- Offers information on the profile of the plant. Includes distribution, growth habit, classification and images.
- White Flower Farm: Heliotropium (Heliotrope)
- Presents information on the distinguishing characteristics of the plant. Includes growing guide, pruning and fertilizing.
- Wild Flower Center: Ehretia anacua (Teran and Berl.) I.M. Johnston
- Offers description on the physical characteristics of the plant. Includes distribution, growth, propagation and remarks.
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