Parahyparrhenia A. Camus 1950
Creators: name: Landge, Shahid Nawaz
name: Shinde, Rajendra D.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Poales
Poaceae
Parahyparrhenia

description: Key to genera allied to Parahyparrhenia
1. Callus of sessile spikelet obtuse .........................................................................................................................................................2
1. Callus of sessile spikelet acute to pungent (if obtuse, then, in some Hyparrhenia)...........................................................................8
2. Sessile spikelet inserted within a cavity at apex of a rhachis internode; apex of internode dentate or not........................................3
2. Sessile spikelet not inserted within a cavity at apex of a rhachis internode; apex of internode never dentate ..................................7
3. Raceme solitary; pedicel and rhachis internode clavate or bucciniform............................................................................................4
3. Raceme bi-nate, rarely digitate; pedicel and rhachis internode stout (pyriform in Andropogon burmanicus) ..................................6
4. Pedicel bucciniform; pedicelled spikelet much longer than their sessile counterparts; upper glume aristate .................... Diectomis
4. Pedicel clavate or linear-clavate; pedicelled spikelet slightly shorter or equal to their sessile counterparts .....................................5
5. Inflorescence a spiciform-raceme, variously disposed as: simple, compound, paniculate, globose, fastigiated, scanty or linear forms; racemes mostly subtended by a spatheole or an un-specialized sheath; delicate annual to moderately tough grasses ............ ..................................................................................................................................................................................... Schizachyrium
5. Inflorescence not various, composed of only a solitary, spiciform-raceme; raceme not subtended by a spatheole or a sheath; mostly tough grasses ........................................................................................................................................................................... Sehima
6. Aromatic grasses; inflorescence dense, decompound panicle; raceme bi-nate, never digitate, deflexed at maturity, borne on flat, sub-equal raceme bases .................................................................................................................................................. Cymbopogon
6. Non-aromatic grasses; inflorescence not dense, decompound panicle; raceme bi-nate or digitate, not deflexed at all, borne on terete, un-equal raceme bases .................................................................................................................. Andropogon (sensu stricto)
7. Pedicel and rhachis internode with a distinct translucent groove (resinous channel) .................................................... Bothriochloa
7. Pedicel and rhachis internode without a translucent groove, if at all channeled then without a translucent membrane ..................... ........................................................................................................................................................................................ Dichanthium
8. Callus of a pedicelled spikelet long and extended deceptively resembling the pedicel; pedicel very short almost reduced to a stump at the base; pedicelled spikelets over-lapping and subtending sessile spikelets; upper lemma of sessile spikelet entire .................... ........................................................................................................................................................................................ Heteropogon
8. Callus of a pedicelled spikelet short never extended; pedicel always well developed; pedicelled spikelets not subtending sessile spikelets; upper lemma of sessile spikelet bi-lobed ...........................................................................................................................9
9. Sessile spikelets inserted within the cavity of a cupuliform apex of a rhachis internode ........................................... Diheteropogon
9. Sessile spikelets not inserted at the apex of a rhachis internode ......................................................................................................10
10. Lower glume of the sessile spikelet convex or rarely slightly concave on the back or with two or more shallow striations but never a longitudinal groove; upper glume obtuse, acute, mucronate or aristate ........................................................................................11
10. Lower glume of the sessile spikelet with a characteristic longitudinally groove in the middle (see Parahyparrhenia tridentata); upper glume acute to aristate not mucronate....................................................................................................................................13
11. A pair of homogamous spikelets forming an involucre at the base of racemes ................................................................... Exotheca
11. Homogamous spikelets present (rarely absent) but not forming an involucre at the base of racemes.............................................12
12. Callus of pedicelled spikelet stipe-like; upper glume of sessile spikelet aristate (ex-aristate in E. androphila); raceme not deflexed (deflexed in E. archaelymandra)....................................................................................................................................... Elymandra
12. Callus of pedicelled spikelet not stipe-like; upper glume of sessile spikelet ex-aristate; raceme deflexed at maturity (in few not deflexed at all) ................................................................................................................................................................ Hyparrhenia
13. Raceme-bases produced at the tip into a long scarious vestigial appendage; racemes (1–) 2 (–10) awned per pair ........................... .......................................................................................................................................................................................... Hyperthalia
13. Raceme-bases without any distinct appendage (see some forms of Parahyparrhenia annua); racemes 4–14 awned per pair........... ................................................................................................................................................................................. Parahyparrhenia
description: Published as part of Landge, Shahid Nawaz & Shinde, Rajendra D., 2022, A taxonomic revision of the genus Parahyparrhenia (Poaceae: Andropogoneae) in India and review of African and Thai species, pp. 247-260 in Phytotaxa 541 (3) on pages 249-250, DOI: 10.11646/phytotaxa.541.3.4, http://zenodo.org/record/6392620