rymcdaniel's Identifications

Note: Following some of the observations made recently (https://www.inaturalist.org/observations/6362774) to iNat for the greater North Texas area we think this might be Mountain Pink but we can use your assistance (and it's much appreciated) in making its correct ID. Thanks! @gcwarbler

Genus Centaurium - Needs ID

22 May 2017
Unicorn Lake
Denton, Denton County, Texas

Need assistance making the species ID on this wildflower in the genus Centaurium. It’s bound to be one of the following five per the online reference obtained at the Lady Bird Johnson Wildflower Center (or maybe not at all). Here’s the link and the possibilities listed there: http://www.wildflower.org/plants/search.php?search_field=centaurium&family=Acanthaceae&newsearch=true&demo=

1. Centaurium beyrichii – common names: Mountain Pink, Meadow Pink, Catchfly, Quinineweed
2. Centaurium calycosum – common names: Arizona Centuary, Shortflower Centaury, Rosita, Buckley Centuary
3. Centaurium texense – common names: Lady Bird’s Centuary
4. Centaurium venustum – common names: Charming Centaury
5. Centaurium glanduliferum – common names: Sticky Centaury

Note: Based on the correct ID lent by Chuck Sexton it is possible to state that this is the first iNat record of Arizona Centaury (Zeltnera calycosa) in Denton County, Texas: https://www.inaturalist.org/observations?place_id=1862&taxon_id=357977