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Texas thelypody

Habit Annuals; slightly glaucous, glabrous.
Stems

usually branched distally, 1.3–4.8(–6.1) dm.

Basal leaves

(and proximal cauline): petiole 1–2.5(–4) cm;

blade oblanceolate or spatulate in outline (lateral lobes often oblong, sometimes ovate), (3.4–)5–15(–24) cm × (11–)15–35(–55) mm, margins pinnately lobed (lobes dentate, entire, or repand).

Cauline leaves

petiolate;

blade often pectinate (lobes linear), similar to basal, much smaller, margins pinnately lobed.

Racemes

somewhat lax, considerably elongated in fruit.

Flowers

sepals spreading or ascending, oblong to linear-oblong, (2.5–)3.5–5 × 1–1.5 mm;

petals white, spatulate to oblanceolate, (3.5–)4–6.5(–7) × (0.5–)1–2 mm, margins not crisped, claw differentiated from blade (widest at base);

nectar glands confluent;

filaments equal, (4–)4.5–6.5(–7) mm;

anthers oblong, (1–)1.5–2 mm, circinately coiled;

gynophore 0.5–1(–2) mm.

Fruiting pedicels

horizontal to divaricate, sometimes reflexed, straight or incurved, slender or stout, (4–)6–2(–3.5) mm, slightly flattened at base.

Fruits

usually divaricate, rarely ascending, torulose, straight or slightly recurved, flattened, (1.9–)2.8–6(–7) cm × (1–)1.3–1.5(–1.7) mm, (replum not constricted between seeds);

ovules 28–48 per ovary;

style usually conical to subconical, rarely subcylindrical, 0.8–1.5(–3) mm.

Seeds

(1–)1.2–1.5 × 0.8–1(–1.3) mm.

2n

= 26.

Thelypodium texanum

Phenology Flowering Feb–Apr.
Habitat Barren hillsides, creek beds, stream banks
Distribution
from FNA
NM; TX
[BONAP county map]
Discussion

The type of Thelypodium tenue is an immature, somewhat abnormal specimen with rather slender pedicels longer than those typical of T. texanum. In all other aspects, including habitat and geography, it belongs in T. texanum. Repeated attempts to recollect T. tenue were unsuccessful. Plants of T. texanum disjunct in New Mexico were misidentified by R. C. Rollins (1993) as Sibara grisea.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 7, p. 738.
Parent taxa Brassicaceae > tribe Thelypodieae > Thelypodium
Sibling taxa
T. brachycarpum, T. crispum, T. eucosmum, T. flexuosum, T. howellii, T. integrifolium, T. laciniatum, T. laxiflorum, T. milleflorum, T. paniculatum, T. repandum, T. rollinsii, T. sagittatum, T. stenopetalum, T. wrightii
Synonyms Sisymbrium texanum, Sibara grisea, Stanleyella texana, T. tenue
Name authority (Cory) Rollins: Contr. Dudley Herb. 3: 371. (1946)
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