Flower, fruit phenology and flower traits in Cordia boissieri (Boraginaceae) from northeastern Mexico

PeerJ. 2016 May 17:4:e2033. doi: 10.7717/peerj.2033. eCollection 2016.

Abstract

We characterized variations in Cordia boissieri flowers and established if these variations occur between plants or between flowering events. Flowering and fruiting was measured for 256 plants. A GLM test was used to determine the relationship between flowering and fruit set processes and rainfall. We performed measurements of floral traits to detect variations within the population and between flowering events. The position of the anthers with respect to the ovary was determined in 1,500 flowers. Three out of four flowering events of >80% C. boissieri plants occurred after rainfall events. Only one flowering event occurred in a drought. Most plants flowered at least twice a year. The overlapping of flowering and fruiting only occurred after rainfall. Anthesis lasted three-to-five days, and there were two flower morphs. Half of the plants had longistylus and half had brevistylus flowers. Anacahuita flower in our study had 1-4 styles; 2-9 stamens; 6.5-41.5 mm long corolla; sepals from 4.5-29.5 mm in length; a total length from 15.5-59 mm; a corolla diameter from 10.5-77 mm. The nectar guide had a diameter from 5-30.5 mm; 4-9 lobes; and 5 distinguishable nectar guide colors. The highest variation of phenotypic expression was observed between plants.

Keywords: Anacahuita; Floral dimorphism; Heterostyly; Rainfall; Tamaulipan thornscrub.

Grants and funding

This research was partially supported by a grant from CONACYT 230073 and PAICYT UANL. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.