Houstonia croftiae – Croft's bluet
[Texas Endemic]

H. croftiae, 18 March 2004	H. croftiae, 18 March 2004
H. croftiae, 18 March 2004	H. croftiae, 18 March 2004

Houstonia subviscosa – nodding bluet
[Texas Endemic]

H. subviscosa, 18 March 2004	H. subviscosa, 20 March 2007
H. subviscosa, 20 March 2007	H. subviscosa, 2 April 2004