Houstonia purpurea Linnaeus, Species Plantarum 1: 105. 1753.

"Habitat in Virginia." RCN: 858.

Lectotype (Reveal & al. in Huntia 7: 234. 1987): Clayton 63 [ “506”] (BM-000042707).

Current name: Houstonia purpurea L. ( Rubiaceae).

Note: Terrell (in Rhodora 61: 168. 1959) evidently regarded material on 128.2 (LINN) as the type, but this collection was a later addition to the herbarium, and ineligible. Reveal & al. designated what is evidently Clayton 63 (BM) as lectotype, despite describing it as Clayton 506. Subsequently, Terrell (in Syst. Bot. Monogr. 48: 50. 1996) has rejected their choice in favour of Clayton 63, but it seems clear that both are talking about the same sheet and there has merely been confusion over labelling.