Key to Rytidosperma

View taxon page for Rytidosperma

(For a list of species in Rytidosperma, use the above link.)

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Upper and lower 

lemma 

In Poaceae, the lower, generally larger of two sheathing bracts subtending a flower, generally ensheathing the palea (in a sterile lemma, the associated flower and sometimes palea are rudimentary or absent); with the palea and flower, comprising the floret.

 hairs (except callus) in 2 continuous rows of tufts ..... R. caespitosum

1' Upper lemma hairs (except callus) in isolated tufts or in tufts at margins only, lower row of tufts generally continuous

2. Callus hairs generally overlapping lower row of lemma hairs; lateral lemma 

lobes 

1. A major expansion or bulge, such as on the margin of a leaf, sepal, or petal, or on the surface of an ovary. 2. The free tips of otherwise fused structures, such as sepals or petals; larger than teeth.

gradually narrowed to 

awn 

1. Bristle-like appendage or elongation, generally terminal. 2. Stiff, needle-like pappus element in Asteraceae.

; central awn 5–17.5 mm ..... R. penicillatum

2' Callus hairs rarely reaching lower row of lemma hairs; lateral lemma lobes abruptly narrowed to awn; central awn 11–14 mm ..... R. racemosum

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