Myosotis chaffeyorum
Myosotis chaffeyorum is a species of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand. Carlos Lehnebach described the species. Plants of this species of forget-me-not are perennial with a creeping habit, bracteate inflorescences, and white corollas. Taxonomy and Etymology. The type specimen of "Myosotis chaffeyorum" is lodged at the Allan Herbarium (CHR) of Manaaki Whenua - Landcare Research, Lincoln. The specific epithet, "chaffeyorum", is named after two people: Annie Selina Chaffey (1877–1953) and Henry Fox Chaffey (1868–1951) who lived in the area where this species is found. "Myosotis chaffeyorum" was shown  to be a part of the monophyletic southern hemisphere lineage of "Myosotis" in phylogenetic analyses of standard DNA sequencing markers (nuclear ribosomal DNA and chloroplast DNA regions). The sequences of "M. chaffeyorum" grouped with individuals of other northern South Island species in both datasets, as well as some North Island species in the nulcear ribosomal DNA dataset. Description. "Myosotis" "chaffeyorum" plants are single rosettes. The rosette leaves have petioles 5–29 mm long. The rosette leaf blades are 4–17 mm long by 3–16 mm wide (length: width ratio 1.1–1:5 1), broadly elliptic, orbicular, obovate or very broadly obovate, widest at or  above the middle, with an obtuse apex. The upper surface of the leaf is densely covered in straight, appressed, antrorse (forward-facing) hairs that are angled away from the mid vein, while on the lower surface the hairs are the same but oriented parallel to the mid vein. Each rosette has 3–7 sprawling, creeping, ascending or prostrate, unbranched or branched, bracteate inflorescences that are 13–23 cm long. The cauline leaves on the lower part of the inflorescence are similar to but smaller than the rosette leaves, and decrease in size toward the tip. There can be up to 17 flowers  in each inflorescence, each one borne on a short pedicel and with a bract. The calyx is 2–3 mm long at flowering and 3–4 mm long at fruiting, lobed to slightly more than half of its length, and densely covered in short, straight, antrorse hairs. The corolla is white up to 5 mm in diameter, with a cylindrical tube, petals that are rounded and flat, and small yellow scales alternating with the petals. The anthers are partly exserted, with the tips or the upper half only surpassing the scales. The four smooth, shiny, brown or dark brown nutlets are 1.2–1.5  mm long by 0.8–0.9 mm wide and ovoid in shape. "M. chaffeyorum" has "M. uniflora" type pollen. The chromosome number of "M. chaffeyorum" is unknown. It flowers from October to February and fruits in January and February. Distribution and Habitat. "Myosotis chaffeyorum" is endemic to the South Island of New in Western Nelson, Sounds-Nelson and Marlborough, from (50–)550–1100 m elevation. Anthony Druce collected the type specimen of this species from Takaka Valley in north-west Nelson in 1977. Conservation Status. The species is listed as Threatened - Nationally Critical the most recent assessment (2017-2018) of the New Zealand Threatened  Classification for plants. It also has the qualifiers "DP" (Data Poor), "RR" (Sparse) and "Sp" (Sparse). "M. chaffeyorum" is found on limestone, marble or ultramafic bluffs and rocks, usually on bare, dry soils, in shady places.