Flora of North America species comparison

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Desmodium marilandicum

Maryland tickclover, smooth small-leaf tick-trefoil
Habit Herbs, perennial.
Stems

ascending to erect, usually striate, branched or unbranched, 30–150 cm, glabrous or sparsely to densely uncinate-puberulent, sometimes also patent long-pilose.
Leaves

trifoliolate;

stipules caducous or moderately persistent, subulate to narrowly ovate, 2–5 mm;

petiole 1–30 mm;

leaflet blades narrowly ovate, elliptic, elliptic-ovate, ovate-rhombic, or suborbiculate, apex obtuse or acute, mucronulate, surfaces sparsely to densely uncinate-puberulent and appressed-villous abaxially, uncinate-puberulent or glabrescent adaxially;

terminal blade 9–75 × 6–33 mm, length 1.5–4(–5) times width.
Inflorescences

terminal and branched, axillary and unbranched;

rachis uncinate-puberulent;

primary bracts ovate, 1.5–3 mm.
Pedicels

3–19 mm, uncinate-puberulent.
Flowers

calyx 1.5–2.5 mm, pubescent (not uncinate-puberulent), tube 1 mm;

abaxial lobes 1.2–1.5 mm, lateral lobes 1 mm;

corolla usually lavender to red-violet or pink-purple, rarely white, 4–6 mm.
Loments

sutures crenate abaxially, sinuate adaxially;

connections adaxial, 1/4–1/2 as broad as segments;

segments 1–4, broadly elliptic, 3.5–5.5 × 2.5–4 mm, rounded abaxially, convex adaxially, uncinate-puberulent throughout;

stipe 1–2 mm.
2n

= 22.

Desmodium marilandicum
Distribution
from USDA
e United States; sc United States; West Indies
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[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

Desmodium ciliare, D. lancifolium, and D. marilandicum have generally been recognized as closely related but distinct species in floras of the United States. They commonly have two or three articulate, small loments. D. Isely (1990, 1998) grouped them as the D. ciliare Group and regarded forms intermediate between them as putative hybrids: D. ciliare × D. marilandicum and D. ciliare × D. lancifolium. They have been separated by differences in the leaflets and pubescence, but the differences are not always clear. They are treated here as one species with three varieties.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Terminal leaflet blades elliptic-ovate to narrowly ovate, 50–75 × 20–33 mm, apex acute to obtuse.
var. lancifolium
1. Terminal leaflet blades elliptic, ovate, ovate-rhombic, or suborbiculate, 9–40 × 6–17 mm, apex obtuse.
→ 2
2. Petioles 12–30 mm, sparsely uncinate-puberulent; stems with a few, scattered hairs; pedicels (6–)8–19 mm.
var. marilandicum
2. Petioles 1–15 mm; stems and petioles uncinate-puberulent and patent long-pilose; pedicels.
var. ciliare
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Desmodium
Sibling taxa
D. arizonicum, D. batocaulon, D. canadense, D. canescens, D. cinerascens, D. cuspidatum, D. floridanum, D. grahamii, D. gramineum, D. illinoense, D. incanum, D. intortum, D. laevigatum, D. lindheimeri, D. lineatum, D. metcalfei, D. nuttallii, D. ochroleucum, D. paniculatum, D. procumbens, D. psilocarpum, D. psilophyllum, D. retinens, D. rosei, D. rotundifolium, D. scopulorum, D. scorpiurus, D. sessilifolium, D. strictum, D. tenuifolium, D. tortuosum, D. triflorum, D. tweedyi, D. viridiflorum, D. ×humifusum
Subordinate taxa
D. marilandicum var. ciliare, D. marilandicum var. lancifolium, D. marilandicum var. marilandicum
Synonyms Hedysarum marilandicum, Meibomia marilandica
Name authority (Linnaeus) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle: Prodr. 2: 328. (1825) — (as marylandicum)
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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