Flora of North America species comparison

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Soliva

burrweed
Habit Annuals, (1–)2–10(–30+) cm (taprooted, often stoloniferous and/or mat-forming).
Stems

1–5+, ± procumbent to erect, simple or branched, glabrous or strigillose to villous [piloso-hispid] (hairs mostly basifixed).
Leaves

basal or basal and cauline; alternate;

sessile or petiolate (bases ± clasping);

blades ± obovate to spatulate, usually (1–)2–3-pinnately or -pinnati-palmately lobed (ultimate lobes oblong or lanceolate to oblanceolate or spatulate), ultimate margins entire or dentate, faces glabrous or strigillose to villous.
Involucres

± hemispheric or broader, 2–8+ mm diam.
Receptacles

flat to hemispheric or conic, epaleate.
Ray florets

0 (peripheral, pistillate florets 5–100+ in 1–8+ series; corollas 0, styles sheathed by pericarp tissues, soon indurate, becoming spinelike).
Disc florets

2–8+, functionally staminate;

corollas yellowish or whitish, tubes ± cylindric, throats campanulate to funnelform, lobes (2–)4, ± deltate (without resin sacs).
Phyllaries

persistent, 5–8+ in 1–2+ series, distinct, lanceolate to ovate, subequal, margins and apices (usually colorless, sometimes brownish) scarious.
Heads

disciform, borne singly (sessile in leaf axils).
Cypselae

(bodies) ± obovate to oblanceolate or oblong-cuneate, ob-compressed or -flattened, winged (wings entire or sculpted), faces glabrous or ± scabrellous to hirtellous or (distally) villous to pilose or arachnose, glabrescent (pericarps without myxogenic cells or resin sacs);

pappi 0 (persistent stylar sheaths indurate, spinelike).
x

= unknown.

Soliva
Distribution
from USDA
South America [Introduced in North America; introduced also in Europe, Asia, Pacific Islands (New Zealand), Australia]
[BONAP county map]
Discussion

Species 4–8 (3 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Cypselar bodies obovate to oblanceolate, margins usually ± winged (wings not transversely rugulose or ribbed), faces glabrous or ± scabrellous to hirtellous
S. sessilis
1. Cypselar bodies oblong-cuneate, margins winged (wings transversely rugulose or ribbed), faces glabrous or distally villous to pilose or arachnose, glabrescent
→ 2
2. Leaves mostly basal, blades 3–8(–15) cm, 2–3-pinnati-palmately lobed; cypselar wings rugulose or ribbed in proximal 2/3, shoulders not spinose
S. anthemifolia
2. Leaves basal and cauline, blades 1–2(–3) cm, 1(–2)-pinnati-palmately lobed; cypselar wings rugulose or ribbed in proximal 9/10, shoulders ± spinose laterally
S. stolonifera
Source FNA vol. 19, p. 545. Author: Linda E. Watson.
Parent taxa Asteraceae > tribe Anthemideae
Subordinate taxa
S. anthemifolia, S. sessilis, S. stolonifera
Synonyms Gymnostyles
Name authority Ruiz & Pavón: Fl. Peruv. Prodr., 113, plate 24. (1794)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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