Contr. U.S. Natl. Herb. 12: 374. 1909
sw United States, n Mexico.
Species 5 (4 in the flora).
Species of Anulocaulis have been considered to belong in a broadly circumscribed Boerhavia, the western A. annulatus most recently so in regional treatments. F. R. Fosberg (1978) argued for an inclusive Boerhavia, and suggested that workers emphasizing differences might wish to recognize segregate genera, as is done in this work.
Flowers of Anulocaulis, particularly in those species with large ones, are slightly bilaterally symmetric because of curvature of the tube, variation in the amount of curvature of the limb, and the downward sweep of the stamens and the style.
|1||Perianth 8-10 mm, tube externally villous; fruits without prominent equatorial ridges (sometimes faint in Anulocaulis annulatus)||> 2|
|1||Perianth 9-35 mm, tube glabrous or minutely pubescent at edge; fruits with prominent equatorial flange||> 3|
|2||Flowers 5-15 in umbel-like clusters; fruits broadly fusiform, with 10 narrow, well- defined linear ribs||Anulocaulis annulatus|
|2||Flowers usually borne singly; fruits turbinate, bluntly 5-angled, ribs indefinite||Anulocaulis eriosolenus|
|3||Perianth lobes flared but not reflexed; perianth 25-35 mm||Anulocaulis leiosolenus|
|3||Perianth lobes sharply reflexed; perianth 9-10 mm||Anulocaulis reflexus|
|Author||Richard W. Spellenberg +|
|Common name||Ringstem +|
|Distribution||sw United States + and n Mexico. +|
|Etymology||Latin anulus, ring, and caule, stem, in reference to the sticky internodal rings +|
|Illustration copyright||Flora of North America Association +|
|Illustrator||Bee F. Gunn +|
|Publication title||Contr. U.S. Natl. Herb. +|
|Publication year||1909 +|
|Source xml||https://firstname.lastname@example.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse grained fna xml/V4/V4 44.xml +|
|Taxon family||Nyctaginaceae +|
|Taxon name||Anulocaulis +|
|Taxon parent||Nyctaginaceae +|
|Taxon rank||genus +|
|Volume||Volume 4 +|