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Published In: Neogenyton 2. 1825. (Neogenyton) Name publication detail

Project Name Data (Last Modified On 8/4/2017)
Acceptance : Accepted

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33. Ptilimnium Raf. (mock bishop’s weed)

(Easterly, 1957)

Plants annual, glabrous. Stems erect or ascending. Leaves alternate (basal leaves usually absent at flowering), short-petiolate or more commonly sessile, the sheathing bases not or only slightly inflated. Leaf blades narrowly ovate to oblong-ovate in outline, pinnately 2–3 times dissected, the usually numerous ultimate segments narrowly linear, usually threadlike. Inflorescences terminal and axillary, compound umbels, short- to more commonly long-stalked. Involucre of few to several bracts. Rays 4–25. Involucel of 2–5(–7) bractlets, these mostly shorter than the flower stalks, linear. Flowers 5 to numerous in each umbellet. Sepals minute, narrowly to broadly triangular scales. Petals obovate, often appearing shallowly notched, but narrowed or tapered abruptly to a short, slender tip, white. Ovaries glabrous. Fruits broadly ovate to nearly circular in outline, slightly flattened laterally, glabrous, the mericarps with the 5 ribs rounded. Four species, eastern and central U.S.


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1 1. Bracts of the involucre mostly divided into 3 threadlike segments; sepals minute, broadly triangular scales ... 1. P. CAPILLACEUM

Ptilimnium capillaceum
2 1. Bracts of the involucre mostly entire; sepals minute, narrowly triangular scales

3 2. Main segments of the leaf blade in whorls along the rachis; fruits 2–4 mm long, with relatively narrow, inconspicuous, dark brown surfaces between the lateral ribs and the commissures (also between the ribs) ... 2. P. COSTATUM

Ptilimnium costatum
4 2. Main segments of the leaf blade alternate or opposite along the rachis; fruits 1.0–1.5 mm long, with relatively broad, conspicuous, straw-colored to light yellowish brown surfaces between the lateral ribs and the commissures (areas between the ribs have reddish brown oil tubes) ... 3. P. NUTTALLII Ptilimnium nuttallii
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