Pesky Acanthaceae: How to tell Justicia croceochlamys from Schaueria calytricha

Justicia croceochlamys showing its distinctive anthers.
Justicia croceochlamys: Type locality is Colombia. Yellow calyx. White flowers to 4 cm long. Yellow bracts subtending the flowers to 3.0 cm long by 0.5 mm wide. Bractlets (?) can be longer.
Two anthers. Anthers two lobed, upper lobe attached at an angle (but with no tail), lower lobe attached parallel to filament and with a short tail.
From: The Acanthaceae of Colombia. Emery C. Leonard. 1958. In: Contributions from the United States National Herbarium, Volume 31, published by the Smithsonian Institution.
Full text available at the Biodiversity Heritage Library.
Page 532: Original species description in Latin.
Page 533: Illustration (including anther) & English description.

Schaueria calytricha: Type locality is Brazil. Yellow calyx. Yellow flowers to 4.5 cm long. Yellow bracts to 1.1 cm long by 1.0 mm wide.
Two anthers. Anthers two lobed, both lobes attached parallel to the filament and lacking tails.
From: Côrtes, Ana Luiza A., Thomas F. Daniel, and Alessandro Rapini. "Taxonomic revision of the genus Schaueria (Acanthaceae)." Plant Systematics and Evolution 302, no. 7 (2016): 819-851.
Full text available at Researchgate.
Page 826: Key to the species of Schaueria.
Page 820: Decsription of anthers found in the monophyletic Schaueria. Page 829, 831, 832: Description of S. calytricha. Page 830: Illustration of S. calytricha.

**Côrtes et al. (2016) recognize 14 species of Schaueria, three with yellow flowers and the others with white flowers. Many of these have relatively long, narrow calyx lobes or bracts among the flowers and iNaturalist has few (or no) photos of them, so be cautious when assigning species-level IDs.

Posted on August 06, 2022 08:07 PM by m_whitson m_whitson


Thanks for the comparison!

Posted by jasonrgrant almost 2 years ago

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