Rosaceae (Rose family)
perennial herbs, shrubs, or small trees.
- Leaves – alternate,
opposite in Coleogyne,
simple or compound, often armed with prickles, usually with stipules, often
borne in clusters of short side branchlets
(spurs) in shrubs.
- Flowers – mostly
complete (incomplete in Coleogyne), perfect, actinomorphic; perianth and
stamens attached to the rim of a floral tube (hypanthium).
- Calyx – 5 fused sepals
- Corolla – 5 free petals (absent
- Androecium – stamens usually
- Gynoecium – pistile
1-many; if one, then compound, composed of 2-5 carpels; if several or
many, then simple and free, each representing a single carpel. Ovary
superior or inferior.
- Fruit – various types:
achenes, drupes, follicle, pome, rose hip, aggregation of druplets.
family is amply represented in southern Nevada;
its members often found at mid to high elevations, in blackbrush
community and upward to the tops of our desert mountain ranges. Blackbrush forms dense stands where it occurs,
generally considered a relictual and ecotonal plant, it occupies
the landscape between the creosote-bursage community and the sagebrush
community in many areas of Nevada.
- Economic plants
- Food: Eriobotrya (loquot), Fragaria (strawberry), Malus (apple), Prunus
(almond, apricot, plum, peach, prune, nectarine), Pyrus (pear), Rubus
- Toxic: Prunus (hydrocyanic acid in
- Medicinal: Prunus (laetrile from
seeds), Rosa (rose hips)
- Perfumes: Rosa (attar of rose)
unifying feature of the Rose family is the actinomorphic, perfect flower
with prominent cup-like hypanthium, and many exserted
stamens. Shallow flowers have easily accessible nectar by a nectariferous disk, and insects collect abundant
fruit morphology is very diverse from rose hips (swollen hypanthium
surrounding numerous achenes), to strawberries (enlarged fleshy receptacle
covered with achenes) to blackberries (aggregate fruit with an elongate
receptacle bearing numerous drupelets) to the inferior ovary of the
apple’s pome, and the almond’s drupe.
the Fabaceae is united by its fruit type and is
very diverse in its floral morphology, the Rosaceae
is united in its floral morphology and is very diverse in its fruit types.