Onobrychis maassoumii Kaveh, Amirah. & Kaz. Osaloo, 2019

Kaveh, Akram, Amirahmadi, Atefe, Nafisi, Haniyeh & Kazempour-Osaloo, Shahrokh, 2019, Onobrychis maassoumii (Fabaceae-Hedysareae), a new species from Iran, Phytotaxa 406 (1), pp. 55-63 : 56-58

Onobrychis maassoumii Kaveh, Amirah. & Kaz. Osaloo sp. nov. ( Figure 1 ).

Type:— IRAN, Tehran, Alborz Mountain, Lashgarak, Tello road, 1600–1700 m, 18 June 2010, Kazempour-Osaloo et al. 106219 (holotype TARI!, isotype TMUH!).

Diagnosis: Onobrychis maassoumii is distinguished from O. gaubae in possessing greenish habit, leaflets with upper glabrescent surface, bracts 5–6 mm, calyx teeth 2–2.3 times as long as tube and petal wings ciliate. The diagnostic traits of the new species as well as O. gaubae , O. semnanensis and O. mozaffarianii are represented in Table 2.

Description: Ascending-erect perennial with green habit, up to 65 cm; stems loosely branching, thick with 5 mm diameter, 18–33 cm long, loosely branching, hirtellous or glabrescent at basal part (rootstock); stipules free, membranous, subulate- lanceolate with a wide base, covered with long appressed hairs, 9–12 mm long at stem base and 7–8 mm long in upper parts; basal leaves mostly simple or rarely with 1 pairs of leaflets, with a petiole longer than stem leaves, up to 12 cm long, narrowly ovate (rarely elliptic), 45–50 mm long, 20–25 mm wide, obtuse, shortly mucronulate, stem leaves with 2–3, rarely 4 pairs, 20–35 mm long, 7–15 mm wide, elliptic-ovate, elliptic or narrowly ovate, slightly acute or obtuse, mucronulate, upper surface of leaflets glabrous and lower surface more or less sparingly long hairs, terminal leaflet longer than lateral ones; peduncles longer than leaves up to 13 cm; racemes very dense, many-flowered with long, dense hairs; bracts 5–6 mm, lanceolate, membranous with long hairs; calyx 7–9 mm, covered with hairs, teeth subulate- lanceolate, 5–7 mm long. corolla greenish lemon yellow; standard 12–15 × 9–10 mm,

(UAG)

mostly with green or green- purple veins, with sericeous hairs at dorsal surface, rounded; wings 8–11 mm, veiny, narrowly-curved, acute lanceolate, ciliate; keel oblong, 10–13× 3–3.5 mm long, glabrous, with purple veins, shorter than standard, claw 3–3.5 mm long; ovary ovate-elliptic, 1.5–2× 1–1.2 mm, hairy and stipitate; stipe 0.5 mm long; pods almost semicircular-reniform, 9–10× 6–7 mm, with slightly profound curve in ventral suture, covered with long, white and lanate indumentum as well as 3–4 mm long setae at sutures having long, delicate, lax plumose hairs, turning to purple at mature; stipe 2–3 mm long; one-seeded, seed with 2–2,5 mm long, reniform.

Phenology: flowering and fruiting time is during June–July.

Distribution and habitat: Onobrychis maassoumii is restricted to the Central Alborz Mountains in northeastern Tehran, Iran growing on eroded clay soils at hillsides, 1600–1700 m altitude ( Figure 3 ). The species is known only from the type locality. It is growing along with a dozen of species such as Crambe orientalis L., Lepidium draba L. subsp. draba , Linum album Kotschy ex Boiss. , Melilotus officinalis (L.) Pall. and Carthamus oxyacantha M. Bieb.

Paratype: Iran, Tehran, Alborz Mountains Lashgarak, Tello road, 1600 m, 2011, 12 June, Kazempour-Osaloo et al. 106219a. (TARI!, TMUH!).

Etymology: The specific epithet corresponds to the eminent Iranian botanist, Prof. Dr. Aliasghar Maassoumi, in the honor of his remarkable efforts devoting on the taxonomy of the giant genus Astragalus in Iran.

Figures

FIGURE 1. Onobrychis maassoumii (from the holotype: TARI).A: Habit of plant. Scale in Fig A= 1.6 cm. B: pod, standard, keel, wings, androec ium, calyx.

FIGURE 3. Distribution map of Onobrychis maassoumii in Alborz mountain range in northeastern Tehran, Iran provided in QGIS (QGIS Development Team 2018).