Gymnosteris
Easily the least-conspicuous genus of Polemoniaceae, Gymnosteris is characterized by the absence of true stem leaves, and anthers attached directly to on the corolla (i.e., no filaments). The entire plant is tiny, and noticed only when growing in a large population.
Wherry, E. T. 1944. Review of the genera Collomia and Gymnosteris. Amer. Midl. Nat. 31: 216–231.
	Acanthogilia Aliciella Allophyllum Bonplandia Bryantiella Cantua Cobaea Collomia Dayia Eriastrum Gilia Giliastrum Gymnosteris Ipomopsis Langloisia Lathrocasis Leptodactylon Leptosiphon Linanthus Loeselia Loeseliastrum Microgilia Microsteris Navarretia Phlox Polemonium Saltugilia