Flora of North America species comparison

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Hemizonia congesta

Cleveland's tarweed, hayfield tarweed
Leaf

blades 50–175+ × 2–8(–12+) mm.
Involucres

hemispheric to ± urceolate or globose, 3.5–12 × 3–8+ mm.
Ray laminae

5–12 mm.
Disc corollas

2.5–3.5 mm.
Cypselae

black, 2–3.5 mm.

Hemizonia congesta
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 6 (6 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Heads in spiciform-racemiform to spiciform-paniculiform arrays (heads ± sessile); ray laminae white, abaxially purple-veined
→ 2
1. Heads in racemiform or paniculiform arrays or in glomerules; ray laminae white or yellow, abaxially purple-veined or not
→ 3
2. Peduncular bracts not or barely surpassing phyllaries; calyculi 0; phyllaries 3–7 mm, apices usually shorter than bodies; cypsela widths 0.6–0.75 times lengths
subsp. clevelandii
2. Peduncular bracts (and calyculi) often notably surpassing phyllaries; calyculi usually of 5–7, sometimes 0, bractlets; phyllaries 6–12 mm, apices usually longer than bodies; cypsela widths 0.5–0.6 times lengths
subsp. calyculata
3. Leaves usually puberulent and eglandular throughout, rarely the distal villous and glandular; heads in paniculiform arrays; ray laminae white, not purple-veined
subsp. tracyi
3. Leaves pubescent, sericeous, or villous, all or the distal glandular; heads in paniculiform arrays or in glomerules; ray laminae white or yellow, abaxially purple-veined
→ 4
4. Leaves ± villous (the distal with hairs at margins often longer); some or all heads usually in glomerules, sometimes in corymbiform or paniculiform arrays; phyllaries 6–10 mm, apices usually longer than bodies; ray laminae white
subsp. congesta
4. Leaves pubescent, villous, or sericeous (the distal with hairs at margins not notably longer); heads in paniculiform arrays; phyllaries 3–7(–8) mm, apices usually shorter than bodies; ray laminae white or yellow
→ 5
5. Ray laminae white
subsp. luzulifolia
5. Ray laminae yellow
subsp. lutescens
Source FNA vol. 21, p. 292.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Madiinae > Hemizonia
Subordinate taxa
H. congesta subsp. calyculata, H. congesta subsp. clevelandii, H. congesta subsp. congesta, H. congesta subsp. lutescens, H. congesta subsp. luzulifolia, H. congesta subsp. tracyi
Name authority de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 692. (1836)
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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