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SEED AND CAPSULE MORPHOLOGY IN SIX GENERA OF HEDYOTIDEAE (RUBIACEAE): THECAGONUM, NEANOTIS, DENTELLA, KOHAUTIA, PENTODON, AND OLDENLANDIOPSIS

Edward E. Terrell and Harold Robinson
Journal of the Botanical Research Institute of Texas
Vol. 1, No. 1 (10 AUGUST 2007), pp. 373-384
Stable URL: http://www.jstor.org/stable/41971423
Page Count: 12
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
SEED AND CAPSULE MORPHOLOGY IN SIX GENERA OF HEDYOTIDEAE (RUBIACEAE): THECAGONUM, NEANOTIS, DENTELLA, KOHAUTIA, PENTODON, AND OLDENLANDIOPSIS
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Abstract

Morphological variation in the seeds and capsules of selected species of six genera of Hedyotideae (Rubiaceae) is described and illustrated by scanning electron microscopy. Oldenlandioid (trigonous) seeds occur in the genera Dentella and Pentodon. The numerous areolar tubercles in Pentodon seeds are shown in enlarged views. The seeds in two species of Kohautia have distinctive rounded areolar protrusions. Oldenlandiopsis has unique capsules and seeds, the latter oblate. The sulcate seeds of Thecagonum, an Asian segregate from Oldenlandia, have several rounded or elongate depressions bordered by strongly sinuous walls. Oldenlandia strigulosa, with similar seeds, is formally transferred to Thecagonum. The Asian genus, Neanotis, a segregate from Anotis, has houstonioid seeds with a hilar ridge in a ventral depression. Se describe e ilustra la variación morfológica en las semillas y las cápsulas de especies seleccionadas de seis géneros de Hedyotideae (Rubiaceae) mediante microscopía electrónica de barrido. Las semillas oldenlandioides (trígonas) ocurren en los géneros Dentella y Pentodon. Los tubérculos areolares numerosos en las semillas de Pentodon se muestran a gran aumento. Las semillas de dos especies de Kohautia tienen salientes areolares redondeados distintivos. Oldenlandiopsis tiene las cápsulas y semillas únicas, la última de ellas obladas. Las semillas sulcadas de Thecagonum, un segregado asiático de Oldenlandia, tienen varias depresiones redondeadas o alargadas confinadas por paredes fuertemente sinuosas. Oldenlandia strigulosa, con las semillas similares, se transfiere formalmente a Thecagonum. El género asiático, Neanotis, segregado de Anotis, tiene las semillas houstonioides con una costilla hilar en una depresión ventral.

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