Family Description: The Acanthaceae are a diverse family of dicotyledonous flowering plants, primarily distributed across tropical and subtropical regions. Members are mostly herbs, shrubs, or climbers, and occasionally small trees. Vegetative characteristics include opposite phyllotaxy, often with entire or serrate leaf margins and well-developed lateral veins. Stipules are typically absent, and the stems are frequently swollen at the nodes.
Inflorescences may be terminal or axillary, often forming spikes, racemes, or panicles. Flowers are bisexual, zygomorphic, and usually showy, with a tubular, five-lobed calyx and a similarly shaped, bilabiate corolla. The androecium commonly consists of two or four stamens, which may be didynamous, sometimes accompanied by staminodes. The ovary is superior, bicarpellary, with axile placentation and typically two ovules per locule.
Fruits are mostly explosive capsules with a specialized retinaculum (jaculator) that aids in seed dispersal, a hallmark of the family. Seeds are often flattened and lack endosperm.
Acanthaceae exhibit considerable ecological versatility, occupying niches from rainforest understories to arid scrublands. Noteworthy genera include Justicia, Ruellia, Thunbergia, and Strobilanthes. Many species hold ethnobotanical value or serve ornamental purposes, reflecting both their ecological significance and horticultural appeal.
Family Description: Bignoniaceae, commonly known as the trumpet vine or jacaranda family, is a vibrant group of flowering plants within the order Lamiales. It includes around 80 to 110 genera and over 800 species, primarily distributed in tropical and subtropical regions, with a center of diversity in the Americas.
Most members are woody climbers (lianas), trees, or shrubs, though a few are herbaceous. Leaves are typically opposite and compound, often pinnate, and may feature a terminal leaflet modified into a tendril or hook for climbing. Stems in lianas often show a unique vascular pattern with phloem wedges embedded in the xylem, sometimes forming a cross-shaped structure.
Inflorescences are usually dichasial cymes, and flowers are zygomorphic, bisexual, and showy, often large and trumpet-shaped. The calyx is gamosepalous, with five lobes or bilabiate. The corolla is also gamopetalous, typically campanulate or funnel-shaped, with five lobes. Stamens are usually four, didynamous, with a fifth staminode. The ovary is superior, bilocular with axile placentation, and numerous ovules.
Fruits are often elongated, woody capsules that split open to release flattened, winged seeds, adapted for wind dispersal. Pollination is primarily by insects or birds, depending on floral morphology
Yellow Trumpet Flower, Yellow Trumpet, Common Yellow Elder
Maltese name not known
Jun-Sep
Normal Profile with
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OLEACEAE Juss.
( Olive Family )
Subfamalies: nil.
Family Description: Oleaceae, known as the olive family, is a group of woody angiosperms in the order Lamiales that includes both trees and shrubs with a worldwide distribution, particularly in temperate and subtropical regions. Members typically bear opposite, simple leaves that are often entire and exhibit a clear venation pattern, contributing to their distinctive silhouette. The flowers are generally bisexual and display a consistent symmetry, usually with four free sepals and four free petals, although some variations exist across the genera. Stamens commonly occur in a reduced number, sometimes partially fused, and the ovary is superior and bicarpellary, often forming a single compound structure. This floral organization gives rise to a variety of fruit types—from fleshy drupes, as seen in the olive (Olea), to dry capsules or samaroid fruits in other genera. Notable members of Oleaceae include Fraxinus (ash), Jasminum (jasmine), Forsythia, and Syringa (lilac), many of which are valued for their ornamental appeal, fragrance, or valuable wood products. The family’s diverse morphology and economic importance underscore its significant role in both natural ecosystems and human culture.
Family Description: Orobanchaceae is a monophyletic family of parasitic angiosperms within the order Lamiales that exhibits remarkable evolutionary specialization. Most species in this family are obligate parasites that obtain water, nutrients, and organic compounds exclusively from their host plants through specialized structures known as haustoria. In hemiparasitic members, reduced chlorophyll may permit limited photosynthesis, whereas holoparasitic species often lack chlorophyll entirely and display highly diminished or absent foliage.
The vegetative parts are typically simplified; leaves may be reduced to scale-like structures or completely absent in more advanced parasites. Flowers tend to be small and bilaterally symmetrical, arranged in racemose, spike-like, or dichasial inflorescences. The floral organs are often modified, with a tubular or fusiform corolla sometimes divided into two distinct lips that aid in the attraction of specific pollinators. Following fertilization, the superior, typically capsular fruits dehisce to disperse a vast number of minute seeds—adapted for long-term survival in the soil seed bank. These morphological and reproductive adaptations underscore the extreme specialization of Orobanchaceae to a parasitic lifestyle.
Family Description: Plantaginaceae is a diverse family within the order Lamiales that has undergone significant redefinition in recent decades. Traditionally, the family was more narrowly circumscribed, but modern phylogenetic studies have expanded its boundaries to include genera previously placed in Scrophulariaceae. Members of this family range from modest, ground-hugging herbs to more showy ornamental plants, and even some aquatic species.
The leaves are generally simple and arranged alternately or in basal rosettes, with shapes that can vary from linear to ovate and margins that are often entire. Many species exhibit a clear venation pattern that reinforces leaf structure. Inflorescences in Plantaginaceae are equally variable; some genera display solitary flowers while others feature dense clusters. A common trait among many is the presence of zygomorphic flowers, typically with a bilabiate (two-lipped) corolla that effectively channels pollinators toward the reproductive organs.
The floral parts usually include a calyx of four to five free sepals, and a corolla that may be partially fused into a tubular structure. The ovary is generally superior, and fruit development often results in a capsule that splits open to liberate numerous small seeds. This morphological versatility underscores the family’s evolutionary adaptability, contributing to its broad ecological distribution and its significance in both horticultural and medicinal contexts.
Family Description: Scrophulariaceae, commonly known as the figwort family, comprises a group of flowering plants that include herbaceous species and shrubs, many of which are valued for their ornamental or medicinal properties. Traditionally, this family was defined very broadly—encompassing hundreds of genera and several thousand species—but modern molecular studies have led to a substantial narrowing of its circumscription. Today, the family is recognized as including roughly 60 to 70 genera with around 1,800 species, while many genera previously assigned to it have been transferred to other families such as Plantaginaceae and Orobanchaceae.
Members of Scrophulariaceae typically exhibit zygomorphic (bilaterally symmetrical) flowers with fused petals, often arranged in clusters. The flowers usually bear a characteristic structure, sometimes with a two-lipped appearance, and most species have four stamens, though the number can vary. The leaves are generally opposite or occasionally alternate, and they often lack stipules. These traits, combined with a variety of growth forms and habitat adaptations—from woodland margins to alpine rocky outcrops—reflect the evolutionary diversity and ecological breadth of the group.
The current understanding of Scrophulariaceae underscores the complexity of plant systematics, illustrating how molecular phylogenetic techniques can refine classifications that were once based solely on morphologic characteristics. Despite the taxonomic reshuffling, several genera in the remaining Scrophulariaceae continue to be subjects of botanical and pharmacological interest. This rich evolutionary history and the ongoing refinement of the family’s boundaries make Scrophulariaceae a fascinating example of plant diversity and adaptation.
