Raceme
/reɪˈsiːm/
Definition
Raceme refers to a type of flower cluster, or inflorescence, with multiple stalked flowers attached along an elongated central axis. The oldest flowers open near the base and younger buds develop toward the tip. Unlike a spike, each flower in a raceme has its own short stalk, called a pedicel. This arrangement occurs in many plants, including lupines and currants, and helps describe how flowers are borne on the stem.
Botanical Significance
- Flowering sequence: In a raceme, the lower flowers usually open first and younger buds continue forming toward the tip. This spreads bloom over time and can extend the period for pollination and seed set.
- Value in plant identification: The presence of a raceme helps botanists and gardeners separate similar plants, especially when leaf shape is not enough. It is often used with traits such as flower stalk length, branching, and flower spacing.
- Relationship to similar inflorescences: A raceme is compared with spikes, corymbs, and panicles when describing plant form. These distinctions matter in botany because small differences in branching and flower attachment can support accurate classification.
- Common examples: Many familiar plants bear flowers in a raceme, including lily of the valley and some orchids, currants, and mustards. Seeing this pattern in different plant groups shows that it is a recurring floral arrangement, not a feature of one family alone.
Related Terms
Inflorescence
Inflorescence refers to the arrangement of flowers on a plant, or the complete flowering structure that bears a cluster…
Peduncle
Peduncle refers to the main stalk that supports a flower, a cluster of flowers, or a fruiting structure. It arises from…
Pedicel
Pedicel refers to the small stalk that supports a single flower, fruit, or seed-bearing structure within an…
Rachis
Rachis is the main axis of a compound structure in plants, especially the central stem-like part of a compound leaf or…
Panicle
Panicle refers to a branched flower cluster, or inflorescence, with a main stem and side branches that bear smaller…
Spike
Spike refers to a type of inflorescence, or flower cluster, in which individual flowers are attached directly to the…
Umbel
Umbel refers to a flower-cluster type, or inflorescence, in which several flower stalks arise from a single point at…