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Inflorescence parameters

The parameters in the Inflorescences section describe how inflorescences are created, grow, and are drawn. This explanation covers both male and female inflorescences.

Be careful when you are changing parameters for flowers and inflorescences not to change parameters in the wrong gender. Usually you will want to skip over the male flowers and inflorescences sections unless you have separate male and female flowers on your plant. You can hide the male parameter sections using the popup menu that appears of the parameter sections.

An inflorescence is structure that holds flowers. These are examples of some inflorescences.

gif/inflor_smallhead.gif gif/inflor_largehead.gif gif/inflor_twoflowers.gif gif/inflor_branched.gif gif/inflor_twosmallflowers.gif

Stalk color, pedicel color

The inflorescence stalk is the main stem of the inflorescence that connects to the plant. The pedicel is the small stem that connects each flower to the stalk.

Number of flowers on main branch, per secondary branch

Inflorescence branches come off the main inflorescence stem. Only one level of branching is supported. For a spike inflorescence, put all your flowers on the main branch and none in secondary branches. For an umbel (like an umbrella upside-down), place all the flowers in secondary branches.

Number of secondary branches

If you want your inflorescence to have branches (such as in the fourth example above) you should set this number higher than zero. As with the placement of inflorescences themselves, you need to set this as an absolute number. Try seeing how different numbers of branches look on the inflorescence.

Inflorescence branches are alternate

If this parameter is answered "yes", PlantStudio will place all the secondary branches you specify one at a time on the stem. If you choose "no", which means "opposite", two branches will appear at a time. This is the same as the alternate/opposite leaf arrangements.

Angle of inflorescence branch, pedicel, peduncle

The peduncle is where an axillary inflorescence comes off the main plant stem. The pedicel is the flower stalk.


Flowers spiral around main stem

Normally you will want to leave this turned on; if it is turned off the flowers line up along the stem in perfect order.

Apical (terminal)

This parameter is only used if you have both male and female inflorescences on the plant, one gender in the apical position and the other in the axillary position. In that case you need to identify which gender goes where. Otherwise you can ignore this parameter.

Optimal biomass, Minimum/maximum days for meristem to create, Minimum fraction of optimal biomass needed to create/make flowers, Minimum/maximum days to grow

See the section on
A common suite of parameters for growth.

Days for all flowers to develop

This is the only parameter that determines how long it takes for flowers to appear on the inflorescence. If you specify a number of flowers and end up with fewer, the flowers might not have time to appear before the plant reaches the end of its life cycle. Try reducing this number or increasing the parameter
General: Age at maturity.

Flowers develop from top to bottom

In most plants the oldest flowers are at the bottom of the inflorescence, but in a few it is the other way around. Turn this parameter on if you want reverse timing of flower development. Note that this parameter will only have an effect if it takes a while for all the flowers to appear on the inflorescence -- otherwise they will all be the same age (and make the same biomass demands) at any time so you won't see any difference in size.

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Updated: March 10, 1999. Questions/comments on site to
Copyright © 1998, 1999 Paul D. Fernhout & Cynthia F. Kurtz.